Prof. Sachchida Nand (Sachi) Tripathi

Department of Civil Engineering & Department of Sustainable Energy Engineering

Email : snt@iitk.ac.in, sachchida.tripathi@gmail.com
Phone : +91-512 2597845 (Off) +91-512-2598806 (Res)
Fax : +91-512-2597395

Office Address
National Aerosol Facility building,
Ground Floor, 101,IIT Kanpur – 208016

Lab Address
National Aerosol Facility building,
Ground Floor, 101,IIT Kanpur – 208016

Latest Updates

Bio

Prof. Sachchida Nand Tripathi is the inaugural Dean of Kotak School of Sustainability at IIT Kanpur anda Professor in the Department of Civil Engineering and the Department of Sustainable Energy Engineering.

In the past decade, Prof Tripathi has undertaken seminal work in developing state-of-the-art air quality monitoring and management technologies in India. He is credited with implementing the largest sensor-based air quality network in India, which has resulted in several cities of India starting to adopt this technology to improve decision making. His work has directly impacted policy making at the national level, while continuing to guide over 20 PhD thesis and mentored several successful startups who have gone on to become market leaders.

Prof Tripathi’s broad area of work in atmospheric sciences includes aerosol-induced cloud invigoration effect, regional climate changes, AI/ML-enabled dynamic hyper-local source apportionment and low-cost sensor-based air quality monitoring. He is leading the Government of India approved Centre of Excellence for Air Quality Monitoring technologies (ATMAN), which has already developed new hardware and AI/ML-based analytical techniques which are being used by several states and cities of India.

In October 2024, Prof Tripathi successfully led a consortium of over 20 faculty members from 4 Institutes and 5 large industry partners to be selected for the first ever Government of India-funded “Artificial Intelligence Centre of Excellence (AI CoE) for Sustainable Cities” whose initial mandate has been focused on bringing AI-technologies to energy, air quality, urban mobility and sustainable technologies for waste management. Prof Tripathi is the Project Director of the AI CoE for Sustainable Cities and is engaged in driving the research as well as the impact of these technologies in Indian cities. The team led by Prof Tripathi is developing AI-technologies for optimizing household energy demands in a city of 18 million residents, building real-time air quality monitoring and policy evaluation technologies for air pollution mitigation actions at the city and national level, digital twins for reducing vehicular emissions and improving public transit systems and Drone and vision-based AI-technologies for waste management in Indian cities.

In recognition of his significant contributions, Prof. Tripathi has been honoured with numerous awards in Physical Science as well as in Engineering. He is the recipient of Shanti Swarup Bhatnagar Award, J C Bose National Fellowship and Infosys Prize 2023 in Engineering and Computer Science. He is an elected fellow of the Indian National Science Academy (INSA), Indian National Academy of Engineering (INAE) and National Academy of Sciences of India (NASI), and recipient of the Distinguished Alumnus award of Banaras Hindu University. He currently also holds the Sir M. Visvesvaraya Chair Professorship at the institute. He obtained his BTech from IIT BHU in Civil Engineering in 1992, MTech in Environmental Engineering from MNIT-Allahabad in 1995 and PhD in Atmospheric Physics from University of Reading, UK in 2001. After a brief stint of post-doctoral research at Bhabha Atomic Research Centre and University of Oxford, Prof. Tripathi joined IIT Kanpur as faculty in 2003. read more...

Experience

Courses Taught

  1. SEE211, Energy Climate change and sustainability
    (New Course, Class size :255)
  2. Earth and Environment
    (Two times, Post Graduate Level, Class Size 15)
  3. Atmospheric Physics and Chemistry
    (Three times, PG Level, Class Size 25)
  4. Fate and Transport of Contaminants in Natural Systems
    (Twice, PG Level, Class Size 10-50)
  5. Environmental Quality and Pollution
    (Three times, Under Graduate Level, Class Size 60-80)
  6. Computational Methods in Engineering
    (Three times, Under Graduate Level, Class Size 160-180)
  7. Advanced Mathematics for Civil Engineers
    (Three times, Numerical Methods Module, Class Size 55-70)
  8. Modeling of Natural Systems
    (Two times, PG Level)
  9. Co-Taught Air Pollution and its Control
    (Once, PG Level, Class Size 30)
  1. Dean, Kotak School of Sustainability, IIT Kanpur, 2024-2027
  2. Chairman, Udghosh, IIT Kanpur Main Festival, 2022
  3. Member of Committee on Sustainability of The Association of Academies and Societies in Sciences in Asia(AASSA), 2022.
  4. Member, Institute Information Cell (IC), 2016-2017.
  5. Coordinator, Centre for Environmental Science and Engineering, 2014-2017.
  6. Member, Senate Library Committee, 2013-till date.
  7. Organizer, Alumni Seminar Series, Department of Civil Engineering, 2012-2013.
  8. Senator, Academic Senate, IIT Kanpur, October 2012 to October 2013.
  9. Member, DPGC, Environmental Engineering & Management Programme, 2012-till date.
  10. Member, Institute Research Development Committee, 2010-2012.
  11. Member, DUGC, 2003-2004, 2012-2014.
  12. Faculty In charge, Computer Laboratory, Department of Civil Engineering, 2008-2009
  13. Warden-in Charge, Hall V, March 2008-June 2008
  14. Warden, Hall V, March 2005- February 2008
  15. Convenor, DPGC (EEM), 2004-2005, 2005-2006, 2011-2012.
  16. Organiser, Almuni Seminar Series, Department of Civil Engineering, 2003-2004.

  1. July 2024 onwards

    Dean, Kotak School of Sustainability, Indian Institute of Technology Kanpur, India

  2. May 2023 onwards

    Joint faculty at The Department of Sustainable Energy Engineering, Indian Institute of Technology Kanpur

  3. August 2018 onwards

    Higher Administrative Grade Professor (HAG) Professor, Civil Engineering, IIT-Kanpur, Kanpur, India

  4. June 2018 – May 2021

    Head Department of Civil Engineering, IIT-Kanpur, Kanpur, India

  5. Dec 2015

    Visiting Professor, School of Civil Environmental Engineering, Georgia Institute of Technology, USA

  6. Nov 2014-Oct 2017

    Coordinator Centre for Environmental Science & Engneering, IIT Kanpur

  7. Nov 2014 -Oct 2016

    Adjunct Professor Department of Earth Sciences, IIT Kanpur

  8. June-July 2014

    Visiting Professor School of Civil and Environmental Engineering, Georgia Institute of Technology, USA

  9. May – July 2012

    Professor Laboratoire de Physique et Chimie de Environnement, University of Orleans, France.

  10. April 2012 – July 2018

    Professor Department of Civil Engineering, IIT Kanpur

  11. Aug 2009 – July 2010

    Senior Fellow, NASA Goddard Space Flight Center, Greenbelt, US.

  12. Jan 2008 – Feb 2012

    Associate Professor Department of Civil Engineering, IIT Kanpur

  13. May – July 2006

    Visiting Associate Professor Centre for Climate System Research The University of Tokyo, Japan

  14. June 2004

    Visiting Researcher NOAA Aeronomy Laboratory, Boulder, USA

  15. July 2003 – Dec 2007

    Assistant Professor Department of Civil Engineering and Environmental Engineering and Management Programme Indian Institute of Technology, Kanpur.

  16. Jan 2002 – July 2003

    Post-Doctoral Research Assistant, Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, UK.

  17. Dec 2000-Dec 2001

    Visiting Scientist, Environmental Assessment Division, Bhabha Atomic Research Centre, Mumbai, India.

Service to Community

  1. Member, Academic Council , Shri Mata Vaishno Devi University, Jammu and Kashmir
  2. Member, Board of Governance, Guru Ghasidas Vishwavidyalaya, Bilaspur
  3. Member, Board of Governance, Rajkiya Engineering College,Ambedkar Nagar (U.P.)
  4. Member, High - Powered Steering Committee, National Institute of Research and Application of Natural Recourses to Transform, Adapt and Build Resilience (NIRANTAR), 2023 - 2025
  5. President, Indian Aerosol Science and Technology Association (IASTA) for Jan 2023 - Dec 2025.
  6. External member, Research and Development Board, Coal India Limited, June 2022.
  7. Member of Committee on Sustainability of The Association of Academies and Societies in Sciences in Asia (AASSA), 2022.
  8. Life Membership, South Asian Meteorological Association, 2022 onwards.
  9. Editor, Transactions of INAE, the flagship Journal of Indian National Academy of Engineering, 2022 onwards.
  10. Member, Advisory Board of Environmental Science: Atmospheres, published by the Royal Society of Chemistry, 2021 onwards.
  11. Technical Advisor to Government of Telangana on Air Quality Management, 2021 onwards.
  12. Member, Research and Development sub committee, Commission on Air Quality Management in National Capital Region and adjacent regions, Government of Uttar Pradesh, 2020 onwards.
  13. Member, Indo-Finnish Working Group on Sustainability to explore new avenues for joint STI collaboration, 2020 onwards.
  14. Member, National Committee for India-IIASA Programme, 2020 onwards.
  15. Coordinator, National Knowledge Network to National Clean Air Mission, 2020-24.
  16. Member, Programme Advisory Committee (PAC) on Civil, Infrastructure and Transportation
    Engineering, SERB, Department of Science and Technology, 2020-23.
  17. National Nodal Faculty, National Knowledge Network to National Clean Air Program, 2019-20.
  18. Member, Technology Assessment Panel, India CEO Forum for Clean Air, Confederation of Indian
    Industries (CII), 2019.
  19. Member, Expert Working Group to Review the Import and Export of Hazardous and other Waste,
    Ministry of Environment, Forest & Climate Change, November 2019 to February 2020.
  20. Member, Expert Committee of Climate Change Programme (CCP) under Strategic Programmes,
    Large Initiatives and Coordinated Action Enabler (SPLICE) for implementation of two national
    missions on climate change under Action Plan on Climate Change (NAPCC) viz (a) National
    Mission for Sustaining the Himalayan Ecosystem (NMSHE) and (b) National Mission on Strategic
    knowledge for Climate Change (NMSKCC), Department of Science and Technology, 2019
  21. Member, Committee to examine technological and regulatory issues relating to retrofitting of (i)
    older/petrol/diesel vehicles; (ii) older DG Sets less than 800 kW, Ministry of Environment, Forest
    and Climate Change, 2019.
  22. Member, Scientific Advisory Committee (SAC), National Atmospheric Research Laboratory
    (NARL), 2019.
  23. Member, Steering Committee, National Clean Air Program (NCAP), Ministry of Environment,
    Forest and Climate Change, 2019.
  24. Member, Advisory Committee, International Conference on “Climate Change Impacts,
    Vulnerabilities and Adaptation: Emphasis on India and Neighbourhood, CCIVA 2019, Indian
    Institute of Technology, Kharagpur, February 26 - March 2, 2019.
  25. Member, Cloud Seeding Committee, Uttar Pradesh Government, 2018.
  26. Member, Technical Expert Committee (TEC) for Petcoke and Alternative fuels, Ministry of
    Environment, Forest and Climate Change, 2018.
  27. Member, International Advisory Committee, International Aerosol Conference, 2018.
  28. Member, National Advisory and Technical Programme Committee, International Conference on
    Aerosol Climate Change Connection (AC3), Bose Institute, Darjeeling, April 25-27, 2017.
  29. Member, Technical Programme Committee, Indian Aerosol Science and Technology Association
    (IASTA), conference on Aerosols and Climate Change: Insights and Challenges, PRL,
    Ahmedabad, December 6-8, 2016.
  30. Member, Advisory Council of Mahamana Malaviya Research Centre for Ganga, River,
    Development & Water Resource Management, Government of India.
  31. Expert member, Committee on Environment and Climate Change to review Central Sector
    Scheme and Centrally Sponsored Scheme, Ministry of Environment, Forest and Climate Change,
    Government of India.
  32. Expert Member, Environmental Domain, MHRD’s IMPRINT programme 2016 to till date.
  33. Expert Member, MoWR’s, Indian National Climate Change Committee, 2015 to till date 31.
  34. Member, Institute International Relations Committee, 2015-2016.
  35. Session Convener, Indo-German Frontiers of Engineering Symposium, Potsdam, Germany, May,
    2014.
  36. Session Chair, “Aerosol Characterization: Chemical” in 8th Asian Aerosol Conference, Australian
    Technology Part, Sydney, Australia, December 3, 2013.
  37. Session Convener, Fifth Indo-American Frontiers of Science Symposium, Indo–U.S. Science and
    Technology Forum-U.S. National Academy of Sciences, Agra, India - April 7-10, 2013.
  38. Member, National Advisory Committee, Cloud-Aerosol Interactions and Precipitation
    Enhancement Experiment, Ministry of Earth Sciences, 2013-till date.
  39. Evaluator, ‘Atmospheric Brown Clouds’ project administered by United Nation Environment
    Program, Bangkok, Thailand from November 5, 2012 to January 30, 2013.
  40. Alternate Member, Nanotechnologies Sectional Committee, MTD 33, 2011.
  41. Member, High Level Working Group, Aerosol and Cloud Nucleation, India Meteorological
    Department, Ministry of Earth Sciences.
  42. Member, National Fire Facility at Indian Institute of Technology-Kanpur.
  43. Member, Geophysical Research Letter Editor Search Committee.
  44. Member, National Steering Committee, Cloud, Aerosol and Precipitation Enhancement
    Experiment, Largest Project Ever Taken by Ministry of Earth Sciences.
  45. Expert Member, DST Fast Track Scientist Committee.
  46. Member, Publications Committee, American Geophysical Union, 2008-2010.
  47. Member, Editorial Board, Indian Journal of Aerosol Science and Technology.
  48. Member, Executive Committee, Indian Aerosol Science and Technology Association.
  49. Member, Science Team, Mars Orbiter Mission, ISRO Planex Programme.
  50. Convener, Session on Climate effects of the atmospheric particle system: aerosols and clouds,
    Asia Oceania GeoScience Meeting, Bangkok, 2007.
  51. Participated in Indo-US Frontier of Science and Technology Meeting held in New Delhi, India.
    October 2006.
  52. Reviewer for DST and CSIR project proposals submitted for funding.
  53. Participated in campaigns of national importance organized by ISRO; Land Campaign II over
    North India and Integrated Aerosol, Gases and Radiation Budget (ICARB) that covered land, sea
    and air segment.
  54. Center for Advanced Studies Fellow, Indian Institute of Technology, Banaras Hindu University,
    Varanasi.
  55. Member, Steering Committee, ISRO Space Borne Lidar Project.
  56. Member, Steering Committee (Cloud Studies), CTCZ experiment Department of Science and
    Technology, Govt. of India.
  57. Member, Indian Association for Aerosol, Science and Technology.
  58. Member, American Geophysical Union.
  59. Reviewer for Journal of Geophysical Research, International Journal of Remote Sensing,
    Atmospheric Sciences, Atmospheric Environment, Geophysical Research Letters, Atmospheric
    Research, Atmospheric and Terrestrial Physics. Current Science, Aerosol Science and Technology,
    Tellus B, Space Science Review, Journal of Applied Meteorology, United Nations Environment
    Programme, Planetary and Space Science, Advances in Space Research.
  60. Executed four projects of Indian Space Research Organisation (ISRO), DST and AICTE; three
    projects, sponsored by DST and ISRO are ongoing. Total research funding till date: 500 Lakhs.
  61. Panelist, Workshop on Nanoparticles: Science and Technology, organized by Indian Institute of
    Technology-Bombay under the auspices of Indo-US Forum.
  62. Member, Technical committee, Asian Aerosol Conference, Mumbai, December, 2005.
  63. Convener, Technical (Indian Aerosol Science and Technology Association- IASTA Aerosol,
    Clouds and Indian Monsoon International Conference), November 2004, Kanpur.

Recognition

  1. 2023

    Infosys Prize in Engineering and Computer Science

  2. 2021-26

    J C Bose Fellowship, awarded by SERB, Department of Science & Technology, India

  3. 2018

    UP Ratna Award, Government of Uttar Pradesh

  4. 2015

    Distinguished Alumnus Award, Banaras Hindu University

  5. 2014

    Shanti Swarup Bhatnagar Prize in Earth, Atmosphere, Ocean and Planetary Sciences

  6. 2009

    NASI-SCOPUS Young Scientist Award for highest citation in Earth Sciences

  7. 2003

    All India Council of Technical Education, Young Teacher Career Award

  1. 2024-27

    Sir M. Visvesvaraya Chair Professor

  2. 2021-24

    Arjun Dev Joneja Faculty Chair , IIT-Kanpur 

  3. 2020

    Elected Fellow, Indian National Science Academy

  4. 2015

    Elected Fellow, The National Academy of Sciences, India

  5. 2015-18

    Rajeeva and Sangeeta Lahri Chair Professor

  6. 2015

    Elected Fellow of Indian National Academy of Engineering

  7. 2009-12

    Sir M. Visvesaraya Research Fellowship for excellence in teaching and Research

  8. 2009-10

    NASA Senior Fellowship

Recognition

  • Member, Editorial Advisory Board, Environmental Science & Technology Letters, 2020 onward
  • Member, National Nodal Faculty, National Knowledge Network Partner for NCAP, Ministry of Environment, Forest and Climate Change, 2019.
  • Member, National Clean Air Program (NCAP), Ministry of Environment, Forest and Climate Change, 2019.
  • Member, Cloud Seeding Committee, UP Government, 2018.
  • Member, Technical Expert Committee (TEC) for Petcoke & Alternative Fuels, Ministry of Environment, Forest and Climate Change, 2018.
  • Associate Editor, Journal of Indian Geophysical Union, 2018.
  • Expert member, Committee on “Aerosol, Radiation and Trace Gases”, NARL, Gadanki, 2018.
  • National Coordinator, DST’s National Network Programme on Climate Change and Aerosol, 2018-2021.
  • Member, Research Council of CSIR-National Environmental Engineering Research Institute, 2017-2020.
  • Member, Editorial Board, Journal of Aerosol Science, 2016-2019.
  • Member, Advisory Board of Environmental Science: Processes & Impacts - A Royal Society of Chemistry Publication, 2016-2018.
  • Academic Editor (member of the Editorial Board) of PLOS ONE (2014)

Research

International

  • NASA Goddard Space Flight Center, Greenbelt, USA
  • Department of Physics and Atmospheric Science, Dalhousie University, Halifax, CANADA
  • Department of Chemistry, Atmospheric Sciences, University of Gothenburg, Kemigarden, Sweden
  • Finnish Meteorological Institute, Helsinki, Finland
  • Department of Civil and Environmental Engineering, University of Wisconsin, USA
  • Department of Civil and Environmental Engineering, Georgia Institute of Technology, USA
  • Paul Scherrer Institute, Switzerland
  • UK centre of hydrology & Ecology, Wallingford, UK
  • University of Leicester, UK
  • Duke University, USA

National

  • Reactor Safety Division and Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai
  • Physical Research Laboratory, Ahmedabad
  • Centre of Atmospheric Sciences, IIT-Delhi
  • Centre for Advanced Training, Indian Institute of Tropical Meteorology, Pune
  • IIT Madras
  • IIT Jodhpur
  • Hyderabad university
  • IIT Delhi
  • IIT Bombay
  • IISc Bangalore
  • Manav Rachna International Institute Of Research And Studies, Haryana
  • Indian Institute of Tropical Meteorology, Delhi Branch

Current Ph.D. Students

Rachna Devi

Cont.

Investigation of air quality impacts using portable sensor network

Neha Sinha(Jointly with Dr. Deepika Swami,Department of Sustainable Energy Engineering)

Cont.

Effect of climate change on critical infrastructure

Akanksha

Cont.

Dynamic hyper source attribution of PM2.5 using hybrid method that combines sensors, real time chemical speciation and radiocarbon isotopic measurements

Manish Kumar

Cont.

Understanding Deposition, Resuspension and Cloud Formation Potential of Aerosols in Context of Severe Nuclear Accident

Ashutosh Shukla

Cont.

Source apportionment using UMR and PMF and network analysis

Himadri Sekhar Bhowmik

Cont.

Source apportionment using high end online instruments

Vaishali Jain

Cont.

Chemical characterization and source appointment of aerosols using real time instruments

Current M.Tech. Students

Kartikay Singhal

Cont.

Apoorva

Cont.

Aseem Dubey

Cont.

Analysis of PM 2.5 data of UP and Bihar.

Saurabh Kumar Maurya

Cont.

sensor deployment in a road network

Project Members

Dr. Navdeep Agrawal

Post Doc Fellow

 AMRIT(Ambient Air quality monitoring over rural areas by using Indigenous technology)
Dr. Nimit Godhani

Post Doc Fellow

 AMRIT(Ambient Air quality monitoring over rural areas by using Indigenous technology)
Dr. P. C. Anandh

Post Doc Fellow

 AMRIT(Ambient Air quality monitoring over rural areas by using Indigenous technology)
Dr. Davender Sethi

Post Doc Fellow

 Dynamic Hyper Source Attribution of PM2.5 using hybrid method that combines sensors, real time chemical speciation & radiocarbon isotopic measurements
Dr. Anil kumar

Post Doc Fellow

 Ambient air quality Monitoring over Rural areas using Indigenous Technology (AMRIT)
Snehadeep Ballav

Project Associate

 Ambient air quality Monitoring over Rural areas using Indigenous Technology (AMRIT)
Priyanshu Malik

Project Associate

 Ambient air quality Monitoring over Rural areas using Indigenous Technology (AMRIT)
Subhkaran Mahla

Project Associate

 Ambient air quality Monitoring over Rural areas using Indigenous Technology (AMRIT)

Meenakshi Sundaram B

Consultant

Ambient Air quality monitoring over rural areas by using Indigenous technology(AMRIT)

Amit Vishvakarma

Engineer

Ambient Air quality monitoring over rural areas by using Indigenous technology(AMRIT)

Vikas Kumar Maurya

Engineer

Ambient Air quality monitoring over rural areas by using Indigenous technology(AMRIT)

Harish C. Vishwakarma

Assistant Project Manager

AERONET and MPLNET site maintenance, Technical work and official work for Projects.

Hari Shankar

Sr. Project Mechanic

Technical work and official work for Project and Lab.

Past Members (PhD)

Suneeti Mishra

2024

New Particle Formation and Particle growth study in the Delhi NCR(India) with connection to Haze Formation.

Sidyant Kumar Rao (Jointly with Dr. Sanjay Kumar, AE)

2024

Shock Induced Secondary Atomization

Vipul Lalchandani

2023

Real-Time Chemical Characterization of fine Particulate Matter, and Organic Aerosols Sources, Formation Pathways, and Hygroscopic Properties in the Delhi-NCR Atmosphere Current Position: Research Fellow, School of Geography, Earth, and Environmental Sciences, University of Birmingham

Gaurav Mishra

2021

Growth characteristics of cesium compound aerosols under various saturation conditions. Current position: Research Scientist,Saclay, Île-de-France, France

Kunal Ghosh

2021

Role of ion in aerosol microphysical processes (modeling and experimental studies). Current position: Postdoctoral Fellow, under my guidance in Department of Civil Engineering, Indian Institute of Technology-Kanpur. Current Position : Research Scientist , University of Leeds

Navaneeth M.Thamban

2021

Evolution of size, composition and mixing state of carbonaceous aerosols in Indo-Gangetic Plain. Current position: Postdoctoral Fellow, University of Manchester, UK

Anil Kumar Mandariya

2021

Impact of ambient relative humidity on the growth and evolution of organic aerosol. Current position: Post Doc, Postdoctoral, CESAM Chamber, CNRS - LISA, Créteil, France

Anubhav Dwivedi (Jointly with Dr. Naveen Tiwari, CHE)

2020

Experimental and numerical study on micro-physical properties of aerosols and its behaviour under varying thermal-hydraulic conditions. Current position: Postdoctoral Fellow, Aarhus University, Denmark

Manish Joshi

2018


Formation and evolution characteristics of nuclei mode particles in dense atmospheric and confined aerosol environments. Current position: Scientific Officer ‘E’, BARC, Mumbai Email: mjoshi@barc.gov.in

Chandan Sarangi

2017

Understanding aerosol­surface­cloud­rainfall interactions within Indian summer monsoon region. Current position: Assistant Professor, Department of Civil Engineering, Indian Institute of Technology-Madras Email: chandansarangi591@gmail.com

Shamjad P.M

2017

Impact of carbonaceous aerosol absorption and mixing state on direct radiative forcing in Kanpur-India. Current position: Postdoctoral Fellow, Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia Email: pmshamjad@gmail.com

Abhishek Chakraborty

2016

Fog and organic aerosols interactions: processing, sources, and composition. Current position: Assistant Professor, Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Mumbai Email: abhishekc@iitb.ac.in

Deepika Bhattu

2016

Effect of aerosol size, chemical composition, mixing state and volatility on cloud condensation nuclei activity in the ambient atmosphere. Current position: Assistant Professor, Indian Institute of Technology-Jodhpur Email: deepika.bhattu@psi.ch

Chiranjib Chaudhari

2015

Characteristics of historical climate change over Indo- Gangetic basic: Observational analysis and numirical modeling. Current position: Postdoctoral Researcher, Wilfrid Laurier University, Ontario, Canada Email: chiranjibchaudhuri@gmail.com

Daya Shankar Kaul

2014


Understanding the formation of organic aerosol in urban environment during foggy and nonfoggy episodes. Current position: Assistant Professor, SoT, PDP University, Gujarat Email: dayakaul@gmail.com

J. Jaidevi

2012

Effects of fine particulate matter on human health and climate. Current position: Assistant Professor, Indian Institute of TechnologyRAM, Ahmedabad Email: j.jaidevi@gmail.com

Sumit Kumar Mishra

2011

Numerical estimation of optical properties of pure and polluted mineral dust particle. Current Position: Scientist, Radio and Atmospheric Sciences Division, National Physical Laboratory, New Delhi Email: mishrask@mail.nplindia.ernet.in

Sagnik Dey

2008

Aerosol radiative effects in Kanpur in the Indo-Gangetic basin, northern India. Current position: Associate Professor, Department of Centre for Atmospheric Sciences, Indian Institute of Technology-Delhi Email:sagnik@cas.iitd.ernet.in

Past Members (Project)

Dr. Amit Kumar Yadav

Post Doc Fellow

 Contribution to research for clean air project in India.Current position
Dr.Puneet Kumar Verma

Post Doc Fellow

 Dynamic Hyper Source Attribution of PM2.5 using hybrid method that combines sensors, real time chemical speciation & radiocarbon isotopic measurements. Current position
Dr. Shrivardhan Hulswar

Post Doc Fellow

 Dynamic Hyper Source Attribution of PM2.5 using hybrid method that combines sensors, real time chemical speciation & radiocarbon isotopic measurements
Current position: Scientist , IMD Pune
Dr. T .V Ramesh Reddy

Post Doc Fellow

 EASIUR India - Development of Air Quality modeling decision support tools for policy-makers. Current position: Cstep Bangalore
Dr. Sameer Singh

Post Doc Fellow

 Contribution to research for clean air project in India

Dr. Sandeep Madhwal

Post Doc Fellow

Building capacity to improve air quality in South Asia: Reducing PM2.5 through Low-cost Sensor network driven policy decisions. Current position:Senior Program Associate at World Resources Institute India

Dr. Sandeep Kumar Chaudhry

Post Doc Fellow

 Large-scale Multicity Dense Urban IoT Real-time Air Quality Monitoring Networks in India. Current position: Post Doctoral Research Scientist, Michigan Technological University, USA

Kunal Ghosh

Post Doc Fellow

Low cost sensor for PMUY focusing on human health exposure. Current Position : Research Scientist , University of Leeds

Mohit Kumar

Post Doc Fellow

Deep learning based calibration of air quality sensors

Dr. Preeti 

Post Doc Fellow

 EASIUR India - Development of Air Quality modeling decision support tools for policy-makers. Current Position : Adjunct Assistant Professor, IIIT Nagpur
Dr. Onam Bansal

Post Doc Fellow

 Ambient air quality Monitoring over Rural areas using Indigenous Technology (AMRIT)
Current Position :

M.Tech. Thesis Students

Nishant Ajnoti

2023

Hybrid Instruments Network Optimization for Air Quality Monitoring

Saurabh Kukreti

2020

Impact of variability in initial and boundary conditions of meteorology on the simulated particulate matter concentrations over Delhi during winters using WRF-Chem

Pratapaditya Ghosh

2020

Understanding the non-local and local contributions during a high PM2.5 loading winter episode over the megacity of Delhi using WRF-Chem
Current position:
Email: paditya@iitk.ac.in

Shubham Naresh

2019

Spatial and temporal variability in ionic and metal composition of PM2.5, across five sites of Gangetic plain; seasonality in secondary inorganic aerosol and preliminary source apportionment. Current position: Environmental Engineer, THDC India Limited, Tishikesh, Uttarakhand Email: sshubham93naresh@gmail.com

Himadri Sekhar Bhowmik

2019

Inter and Intra seasonality in carbonaceous species (EC, OC) of PM2.5 aerosol over five sites of Indo-Gangetic plain, preliminary source apportionment and case study on multi-day regional SOA formation during winter at Faridabad. Current position: Pursuing PhD under my guidance in Department of Civil Engineering, Indian Institute of Technology Kanpur

Saad Ahmed

2018

Application of microwave radiometer in nowcasting of convective activity. Current position: Senior Engineer, Tata Consulting Engineers, Noida

Mithun Krishnan K.V.

2017

Seasonal dynamics of surface energy balance over a semi-natural grass land in central Indo-Gangetic Basin. Current position: Pursuing PhD under my guidance in Department of Civil Engineering, Indian Institute of Technology Kanpur

Geet George

2017

Characterisation of cloud vertical structure (CVS) and cloud radiative forcing (CRF) over Kanpur. Current position: PhD Student, Max Planck Institute for Meteorology, Hamburg, Germany

Bhuvana Joshi

2016


Real time size resolved analysis of organics in Kanpur city: A comparative study between fog and no-fog periods. Current position: Assistant Professor – Civil Engineering, Govt. Engineering College, Banswara, Rajasthan

Kuntamukkala Pavan Kumar

2016

Black carbon aerosol microphysical properties variation and electron microscopy study of PM205 in Kanpur. Current position: Software Engineer at Tech Mahindra, Pune

Bharath Kumar, Dual B. Tech – M. Tech

2015

Source apportionment of sub micron aerosol over Kanpur. Current position: Business Analyst, ZS Associates, Gurgaon

Karn Vohra, Dual B. Tech – M. Tech

2015

A chamber study to understand aerosol deposition phenomena. Current position: PhD Scholar in Environmental Health Sciences at University of Birmingham, UK

Tirthankar Chakraborty

2015

Understanding urban micrometeorology and its impact on the heat island of greater Kanpur. Current Position: Ph.D. Student, Yale University, USA

Kundan Kumar

2015

Aerosol direct radiative forcing over Indo-Gangetic basin during pre-mansoon season using WRF-CHEM. Current Position: Assistant Executive Engineer, Office of the Panchayat Raj Superintendent Engineer, Panchayat Raj Circle Adilabad, Tilangana

Vipul Lalchandani

2014

he need for site-, season- and instrument-specific calibrations of a photo-reference method for determining aerosol Black Carbon concentrations and examining color signal of Organic carbon particles. Current Position: Pursuing PhD under my guidance in Department of Civil Engineering, Indian Institute of Technology Kanpur

Amit Sharma

2014

Quantifying health benefits of reducing PM2.5 & ozone concentration using WRF-CHEM model. Current position: Ahmedabad

Alabhya Mishra Dual B. Tech – M. Tech

2014

Electrical properties of Titan and Earth atmospheres. Current position: Associate at BlackRock, Bengaluru

Arun Yadav, Dual B. Tech – M. Tech

2013

An evaluation of WRF-Chem model over the Indian Domain Current position: Flipkart, Bangalore

Anubhav Dwivedi

2013

Investigation of activation kinetics of laboratory generated and ambient particles Current position: Postdoctoral Fellow, Aarhus University, Denmark

Rosalin Dalai

2013

Role of aerosol type and mixing state on CCN activity Current position: Indian Institute of Technology Bhubneshwar

Akhilesh Rawal Dual B. Tech – M. Tech

2012

Study of ion-aerosol near-cloud mechanism to explain cosmic ray-cloud-climate conundrum Current position: Consultant at Boston Consulting Group (BCG), India

Shamjad P.M.

2011

Hygroscopicity, mixing state and enhanced absorption of aerosols Current position: Postdoctoral Fellow, Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia

Priya Choudhry

2011

Validation of MODIS-retrieved AOD over Indo-Gangetic Plain Current position: Group Engineer at SNC-Lavalin Atkins, Bengaluru, Karnataka

Monika Srivastava

2011

Aircraft-based CCN Closure Current position: BBD University, Lucknow

Pawan Kumar Bharti

2010

A study of inter and intra variation seasonal of surface Cloud Condensation Nuclei and chemical closure in Kanpur Current position: SIDBI, Ludhiana

Vishnu Patidar

2009

First surface, spatial and vertical measurements of Cloud CondensationNuclei (CCN)over Indian CTCZ region. Current position: Environmental Engineer

Jariwala Chinmay G.

2009

An observational and laboratory study on the effects of Cloud CondensationNuclei and black carbon aerosol on fog persistence. Current position: Environmental Engineer, Dar AL-Handasah, Pune

Vivek Pratap Singh

2008

An experimental investigation of the effects of environmental and fog condensation nuclei parameters on rate of fog dissipation. Current position: Engineer, Manali

Sanjay Prakash Baxla

2008


A study of ambient ultra fine aerosols using SMPS. Current Position: Sr. Process Design Engineer at SS GAS LAB Asia Pvt. Ltd., New Delhi

Anirban Roy

2008

Measurement and simulation of particulate aerosols. Current Position: Post-Doctoral Researcher, Department of Mechanical Engineering, Carnegie Mellon University, USA

Anilkumar D. Vanga

2007

A numerical study of new particle formation in cirrus cloud. Current Position: Engineer, Jones Lang LaSalle, Mumbai

Sudip Chakraborty

2006

Long term changes in surface and columnar water vapor over North India. Current Position: Research Scholar, NASA Jet Propulsion Laboratory, Defense & Space, Pasadena, CA

Abani Patnaik

2006

Climatology of cloud and aerosol over the Indian subcontinent and adjoining oceans. Current Position: Offshore Structural Engineer, L&T, Mumbai

Roma Srivastava

2006

Study of trace gas concentration over Kanpur region. Current Position: Lecturer, Hindustan College of Engineering, Agra. Email: romasrivastava@gmail.com

Parul Sharma

2006

Study of aerosol chemical composition over Kanpur region. Current Position: Sr Director (HTEM) at Fraud and Identity, Lexis Nexis Risk Solutions, Milpitas, California

Tanveer Ahmed

2005

Charging of radioactive aerosols containment wall of pressurized water reactor. Current Position: Data Scientist, Enterprise Intelligent Automation Practice, Tata Consultancy Services – North America

Nagesh Chinnam

2005

Analysis of ambient particles by high volume sampler and PM10

Shyam Kishor

2005

Investigation into seasonal and diurnal formation of atmospheric nitrate.

B. Tech. Project

Praveen/Naveen

2007

A study of effects of black carbon on cloud microphysical properties using a two-dimensional cloud model.

Nikhil/Gaurav

2006

Retrieval of aerosol organic carbon obtained due to biomass burning from various location of the world.

Shiwesh/Sameer

2005

Parameterization of collision efficiency between of electrically charged aerosol particles and cloud of droplets.

Ashwyn/Sandip

2005

Numerical investigation of atmospheric fogs.

Abhishek/Chandel

2004

Comparison of satellite derived aerosol parameters with ground measured data over Gangetic Basin.

Project Employees

Kuldeep Dixit

Current Position: Project Scientist, CAS, Indian Institute of Technology Delhi Email: dixitkuldeep252@gmail.com

Dinesh Nath

Current Position: Email: dinesh2n@gmail.com

Shilpa Shirodkar

Current Position: Indian Institute of Technology Kanpur Email: md161shilpa@gmail.com

Pravin Kumar Verma

Current Position: Mumbai Email: pravin8724@gmail.com

Vijay Kanawade

Current Position: UGC-Assistant Professor, Centre for Earth and Space Sciences (UCESS), University of Hyderabad, Prof C R Rao Road, Gachibowli, Hyderabad, Telangana – 500 046 Email: vijaypk06@gmail.com

M S Gandhi

Current Position: Pennagaram, Dharmapuri, Tamil Nadu Email: gandhitnau@gmail.com

Mary Michael

Current Position: Trivandrum Email: mary@iitk.ac.in

Beena Umrao

Current Position: New Delhi Email: umrao.beena@gmail.com

Bhola N. Singh

Current Position: Branch Manager, SBI, Lucknow Email: hellobns5@gmail.com

A.R. Ragi

Current Position: Ph.D. Student, Department of CAS, Indian Institute of Technology Delhi Email: ar.ragi@gmail.com

Arindam Ghosh

Current Position: Postdoctoral Fellow, Japan Email: arindamgr@gmail.com

Tanmay Dhar

Current Position: Research Scholar, Department of Civil Engineering, Indian Institute of Technology Bombay Email: tstorm.tanmay@gmail.com

Litty Thomas

Current Position: Kerala

Desh Deepak

Current Position: Mumbai

Nikita Tripathi

Current Position: Chandigarh

Bodhaditya Santra

Email: bodhaditya.santra@gmail.com

Rishi Jain

Email: rishij@iitk.ac.in

M. S. Modgi

Email: moni_g4@yahoo.com

Sanjeev Kumar

Current Position: Self-Employed Email: sanjeev@engineers-india.com

Rina Dutta

Current Position: Doctoral Student, Indian Institute of Technology Kharagpur (WB)

Manoj K. Sagar

Current Position: Bangalore

Saurav Dayal

Current Position: Research Engineer Email: sdayal183@gmail.com

Nimisha Srivastava

Current Position: Research Engineer Email: nimmi30@gmail.com

Narayan

Current Position: Doctoral Student, Mississippi State University, USA Email: narayan.phy@gmail.com

Praveen Pandey

Current Position: Doctoral Student, Katholik University of Leuven, Belgium Email: praveen183@gmail.com

Atul Srivastava

Current Position: Scientist, Indian Institute of Tropical Meteorology, New Delhi Email: atulkms@gmail.com

Subhash Tiwari

Current Position: Self employe Email: stewari@iitk.ac.in



Major Projects

  1. TIGERZ
    Workshop Aerosol Cloud Interaction.International Workshop with ASI on ‘Impact of Haze on Taj Mahal movement
    Summer School on ‘Sustainable Cities

Running Projects

  1. Klenviron Technologies Pvt. Ltd., Testing the Efficacy of Air Purifier Modules Under Outdoor and Room Conditions, 2024-2027.

  2. AICPMU IIT JAMMU, Center of Excellence in Artificial Intelligence for Sustainable Cities, 2024

  3. Bhabha Atomic Research Centre
    Aerosol Transport Behaviour Experiments At National Aerosol Facility In Context Of Nuclear Reactor Accidents
    2023-2025

  4. Clean Air Fund
    Atman-Centre Of Excellence: Core Support Grant
    2023-2025

  5. Clean Air Fund
    Dynamic Hyper-Local Source Apportionment For Real-Time Policy Action
    2023-2025

  6. Rail India Technical & Economic Services Ltd. (RITES)
    DHSA at Kanpur
    2023-2025

  7. International Sustainable Energy Foundation (ISEF)
    Easiur India: Development of Air      Quality Modeling Decision Support Tools for Policy-Makers
    2023-2023

    Children's Investment Fund Foundation (CIFF)
    Centre of Excellence on Air Quality Monitoring Technology
    2022-2025

  8. Open Philanthropy
    To Support the Rural Air Quality Monitoring Project
    2022-2025

  9. Central Pollution Control Board
    Creation of Secretarial Support at IIT Kanpur
    2022-2025

  10. Duke University
    Building Capacity to Improve Air Quality in South Asia: Reducing PM2.5 through Low Cost Sensor Network Driven Policy Decisions
    2020-2023

  11. Swiss Agency for Development and Cooperation
    Contribution to Research for Clean Air Project in India
    2020-2024

Completed Projects

  1. Udupi Power Corporation Limited
    Study on Effect of Coal Blending on Ambient Air Quality and Managment of Fly Ash
    2022-2023

  2. Ericsson India Pvt. Ltd.
    Large-Scale Multicity Dense Urban IoT Real-Time Air Quality Monitoring Networks in India
    2021-2023

  3. Center For Study Of Science Technology And Policy (CSSTP)
    Service Agreement to Carry out Chemical Analysis of the Air Samples
    2022-2023

  4. Devic Earth Pvt. Ltd
    Testing the Efficacy of Pure Skies in Real Field Conditions at a City Deployment
    2022-2024

    5. Clean Air Fund
    Integrated online air pollution monitoring and decision support system
    2021-2022

  5. New Venture Fund
    Development of air quality modeling decision support tools for policy-makers
    2021-2022

  6. National Health Systems Resource Centre
    Evaluation of Pradhan Mantri Ujjawala Yojana (PMUY) in 6 States of India
    2020-2022

  7. Maharashtra Pollution Control Board
    Technical assessment of low-cost sensor based PM2.5 and PM10 monitoring network in Maharashtra
    2020-2022

  8. Maharashtra Pollution Control Board
    Ambient Air Quality and Atmospheric Haze Condition in Mahul Area
    2021-2021

  9. Central Pollution Control Board (CPCB)
    Delhi Air Quality Experiment: A Paradigm Shift In Source Apportionment
    2019-2021

  10. Indo-US Science & Technology Forum (IUSSTF)
    Streaming Analytics over Temporal Variables from Air quality Monitoring (SATVAM)
    2017-2022

  11. Board of Research in Nuclear Sciences (BRNS) and Bhabha Atomic Research Centre (BARC)
    Studies on aerosol behaviour under severe accident conditions in the context of Indian Nuclear Reactors by setting up of National Aerosol Facility
    2015-2018 (extended upto 2020)

  12. Department of Biotechnology
    Joint Research project on Delhi Air Pollution: Health aNd Effects (DAPHNE)
    2017-2021

  13. Bloomberg Philanthropies
    Pilot of Low-Cost Sensor Technologies in Mumbai-IIT Kanpur in Collaboration with Maharashtra Pollution Control Board and Bloomberg Philanthropies
    2020-2021

  14. Device Earth Private Limited
    Testing and efficacy of pure skies under different conditions of temperature humidity wind speed and distance
    2020-2021

  15. Centre for Study of Science, Technology and Policy (CSTEP)
    Source Apportionment Studies-Analysis And Samples
    2021-2021

  16. National Aeronautic and Space Administration
    TIGERZ.
    2008-2021

  17. Shakti Sustainable Energy Foundation
    A Network of Technical Institutions as knowledge Parter of NCAP
     2019-2021

  18. Ericsson India Private Limited
    Realtime Atmos Air Quality Monitoring With Nb-Iot Network
    2019-2021

  19. Uttar Pradesh State Government
    Comprehensive Agriculture Information System
    2019-2020

  20. Centre for Study of Science, Technology and Policy (CSTEP)
    Source Apportionment Studies-Analysis And Samples
    2019-2020

  21. Science and Technology Facilities Council (STFC), UK
    Thermal infrared technologies for supporting environmental assessment and decision making in the Ganges Basin
    2018-2020

  22. Department of Science and Technology (DST)
    Indo-UK joint project on Towards an integrated approach for assessing the impact of climatic stresses on agriculture and the exchange of greenhouse gas on the Indo-Gangetic Plain
    2017-2020

  23. Respirer Living Sciences Private Limited
    Measurement and Calibration of Air Quality Monitors in 10 cities of India
    2018-2020

  24. Indian Space Research Organization (ISRO-GBP)
    Environmental Observatory
    2007-2018

  25. BP India Services Private Limited
    India Air Pollution Study for BP
    2008

  26. Ministry of Earth Sciences
    Indo-UK joint project on South Asian Monsoon: Monsoon Dynamics and thermodynamics from the land surface through convection to the continental-scale (INCOMPASS)
    2015-2018 (extended upto 2019)

  27. Georgia Institute of Technology
    Crowd sourcing water quality: Using mobile technology and rapid microbiological tests to assess drinking water risks in rural India
    2016-2017

  28. United States Agency for International Development
    lNSF-PIRE collaboration: Developing Low-Carbon Cities in India: Focus on Urban Infrastructures, Public Health, Climate Risks and Vulnerability
    2013-2016

  29. Indo-UK Ministry of Earth Sciences and Natural Environmental Earth Sciences
    South Asian Precipitation: A Seamless Assessment SAPRISE
    2011-2016

  30. Bhabha Atomic Research Centre
    Experimental Evaluation of Aerosol Behavior Relevant to Indian Nuclear Reactors
    2013-2016

  31. Department of Science and Technology
    Modeling Relative Impact of Aerosol and LULC Changes on Regional Climate of Ganga Basin
    2013-2016

  32. Ministry of Human Resource Development
    Building a Novel System for Soot: Measurement, Toxicity Assessment and Source Identification
    2014-2015

  33. Finnish Meteorological Institute
    Black and Brown Carbon Influence on Climate Change in India from Local to Regional Scale
    2014-2015

  34. Regional Resources Center for Asia and the PACIFIC (A Centre for Sustainable Development, Collaborating with UNEP)
    Atmospheric Brown Clouds (ABC)
    2012-2013

  35. Ministry of Earth Sciences
    Cosmic Rays-Cloud-Climate Conundrum: Can Ion-Aerosol Near-Cloud Mechanism Explain the Observed Correlations?
    2011-2014

  36. Board of Research in Nuclear Sciences
    Measurement of aerosol and liquid droplet size distributions and validation of aerosol and droplet microphysical models.
    2009-2012

  37. Indo-French Centre for the Promotion of Advanced Research
    Development of a Non-Hydrostatic Finite-Volume Icosabehral Model for Regional/Global Climate Simulation and Weather Forecast.
    2009-2012

  38. Indo-US Science and Technology Forum
    Atmosheric Haze: Adverse Impacts on Glaciers and Cultural Heritage in India.
    2009-2012

  39. Indian Space Research Organization-Geosphere Biosphere program
    Long term variation of Aerosol black carbon over Kanpur region.
    2005-08

  40. Department of Science & Technology
    Impact of anthropogenic aerosols on cloud microphysics.
    2007-10

  41. Indian Space and Research Organization
    Understanding the Role of Cosmic Ray Induced of Total Solar Eclipse in 2009-10.
    2009-2010

  42. Indian Space Research Organisation
    Modeling and parameterization of microphysical and optical properties of mixed-phase clouds over Indiansubcontinent
    2007-2009

  43. Indian Railways (MHRD)
    Laboratory Investigations of Fog Microphysical Properties
    2005-08

  44. Indian Space Research Organization (ISRO)-RESPOND Program, Government of India
    Effects of Ionization Rate Variation on Aerosol and Cloud Microphysical properties
    2003-06

  45. Department of Science & Technology
    Aerosol Optical Properties over Kanpur Region
    2003-06

  46. Indian Space Research Organization (ISRO-GBP), Government of India
    Integrated Campaign for Aerosols, Gases and Radiation Budget (ICARB)
    2006

  47. (ISRO-PLANEX), Government of India
    Aerosol Charging and Electrical Conductivity in the Lower Atmosphere of Mars
    2004-07

  48. Indian Space Research Organization
    Atmospheric Pollution (North India Land Campaign)
    2004-07

Facilities

Measurements

  • Ground based measurements
  • Balloon measurements
  • Aircraft measurements
  • At IIT Kanpur
  • During ICARB Campaign
  • Continental Tropical Convergence Zone (CTCZ) Pilot Aircraft Experiment – 2009
  • Continental Tropical Convergence Zone (CTCZ) Pilot Aircraft Experiment – 2008
  • – AERONET/CALIPSO Validation in India (2008-2011)
  • Surface Energy Flux Measurements-INCOMPASS (2015 onwards)
  • Real-time air quality measurements-IIT Kanpur
    • Currently, the assessment of air quality and source apportionment studies in India are based on offline filter techniques, in which aerosols are collected on filters using air samplers and then analyzed in the laboratories. Typically, these methods are cumbersome, labour intense and time consuming. Technical drawbacks include low temporal resolution and method bias. Accurate measurements of carbonaceous aerosols are also challenging due to positive (e.g., adsorption of organic gases) and negative (e.g., evaporation) attributes of filter sampling. Realizing the need for a rapid, reliable and field implementable method of PM analysis, we proposed a real-time measurement of the PM using mass spectrometry. This combines high-end (detailed information) and low-end (cost-effective) approach. The high-end approach includes measurements using real-time instruments (close to molecular level information using mass spectrometry techniques), and low-end includes the combination of similar mass spectrometry techniques with traditional measurements on collected filters to extract the information close to molecular level. The combination approach is the most accurate and cost-effective way to tackle the knowledge gap in real pollutants level and their source apportionment.  
  • Streaming analytics over temporal variables for Air quality monitoring 
    • The number of deaths attributed to ambient air pollution is staggering, currently estimated at over 600,000 people. The situation in recent years has gotten only worse, with the air quality levels in New Delhi being the worst in many years. At this time, the influences of air pollution on human health are not well understood given an overall lack of knowledge of air pollutant concentrations across India. This lack of spatially and temporally distributed city-wide air quality information prevents a scientific study of its impact on human health and the national economy. We have developed a system that can collect this information sustainably and with low-cost nation-wide to allow policy makers and citizens at large to deploy data-driven control and preventive mechanisms. An NBIoT based Real-time Ambient Air Quality Monitoring technology is being developed, which uses a leading-edge low powered cellular data communication technology. This is highly innovative for ambient air quality monitoring networks. We are the first group in India and possibly in South Asia to have developed such a solution.

EBAM PM 2.5 & PM 10 MONITOR

OPTICAL PARTICLE SIZER

ORGANIC CARBON-ELEMENTAL CARBON ANALYZER

ION CHROMATOGRAPHY

XACT 625i AMBIENT MULTI-METALS MONITORING SYSTEM

Aerosol Deposition Experiment using RF Waves

Phase Doppler Particle Analyser

AERODYNAMIC PARTICLE SIZER

ATOMIZER AEROSOL GENERATOR

AERODYNAMIC PARTICLE SIZER

LASER DOPPLER VELOCIMETER (LDV) & PHASE DOPPLER PARTICLE ANALYZER (PDPA)

MOUDI IMPACTOR

FOG SAMPLER

CLOUD CONDENSATION NUCLEI COUNTER

CEILOMETER

TISCH HIGH VOLUME SAMPLER

GILIBRATOR

GAS ANALYSERS (SO2 , NOx , O3 CO, ZAS UNIT)

AETHALOMETER

HYGROSCOPIC TANDEM DIFFERENTIAL MOBILITY ANALYSER (HTDMA)

PHOTOACOUSTIC SOOT SPECTROMETER

SCANNING MOBILITY PARTICLE SIZER

SINGLE PARTICLE SOOT PHOTOMETER (SP2)

High Resolution Time- of-Flight AEROSOL MASS SPECTROMETER (AMS) Facility under the aegis of EEM Program

MICRO AETHALOMETER

CLOUD COMBINATION PROBE

OPTICAL PARTICLE COUNTER

HYDROMETER

Publications

Journal

2024

231. Sidyant Kumar, Sudama, S.N. Tripathi and Sanjay Kumar, 2024., Drop breakup in bag regime under the impulsive condition, Journal of Multiphase Flow, accepted for publication.

230. Sahu, V., S.N. Tripathi, Sutaria, R., Dumka, N., Ghosh, K., Singh, R.K., 2024., Assessment of a clean cooking fuel distribution scheme in rural households of India – "Pradhan Mantri Ujjwala Yojana (PMUY), 81, 101492, DOI: 10.1016/j.esd.2024.101492.

229. Dey, Swapnil, Arora, V. and S.N. Tripathi, 2024, Leveraging unsupervised data and domain adaptation for deep regression in low-cost sensor calibration, accepted for publication in IEEE Transactions on Neural Networks and Learning Systems.

228. Salana, S., Haoran Yu, Zhuying Dai, P.S. Ganesh Subramanian, Joseph V. Puthussery, Yixiang Wang, Ajit Singh, Francis D. Pope, Manuel Lieva-Guzmán, Neeraj Rastogi, S.N. Tripathi, et al., 2024, Relationship, among PM2.5 mass, oxidative potential, and cellular toxicity across different continents, accepted for publication in Nature communication.

227. Bhowmik, H.S., S.N. Tripathi, Joseph V. Puthussery, Vishal Verma, Jay Dave and Neeraj Rastogi, 2024, Reactive oxygen species generation from winter water-soluble organic aerosols in Delhi's PM2.5, Atmospheric Environment, 22, 100262, DOI: 10.1016/j.aeaoa.2024.100262.

226. S.N. Tripathi., Yadav, S and Sharma K., 2024, Air pollution from biomass burning in India, Environmental Research Letters, DOI: 10.1088/1748-9326/ad4a90

225. Yadav, P., Lal, S., S.N. Tripathi., Jain, V and Mandal, T.K., 2024, Role of sources of NMVOCs in O3, OH reactivity, and secondary organic aerosol formation over Delhi, Atmospheric Pollution Research, 15, DOI: https://doi.org/10.1016/j.apr.2024.102082

224. Liu, X., Turner, J. R., Oxford, C.R., McNeill, J., Walsh, B., Roy, E.L., Weagle, C.L., Stone, E., Zhu, H., Liu, W., Wei, Z., Hyslop, N.P., Giacomo, J., Dillner, A.M., Salam, A., Hossen, A., S. N. Tripathi  et al., Elemental Characterization of Ambient Particulate Matter for a Globally Distributed Monitoring Network: Methodology and Implications, ACS Environmental Science & Technology Air, DOI: 10.1021/acsestair.3c00069

223. Bhattu, D., S. N. Tripathi, Bhowmik, H.S., et al., 2024, Local incomplete combustion emissions define the PM 2.5 oxidative, Nature Communication, 15, 3517, DOI: https://doi.org/10.1038/s41467-024-47785-5

223. Verma. P.K., Devaprasad M., Dave. J., Meena., R., Bhowmik. S. H., S.N. Tripathi and Rostogi. N., 2024., Summertime oxidative potential of atmospheric PM2.5 over New Delhi: Effect of aerosol ageing., Science of the Total Environment, 170984, 920. 10.1016/j.scitotenv.2024.170984

222. Yadav. P., Lal. S., S.N. Tripathi., Jain. V and Mandal. T.K., 2024., Role of sources of NMVOCs in O3, OH reactivity, and Secondary Organic Aerosol Formation over Delhi., Atmospheric Pollution Research, 102082,15, https://doi.org/10.1016/j.apr.2024.102082

221. Ajnoti, N., Gehlot, H and S. N. Tripathi, 2024, Hybrid Instruments Network Optimization for Air Quality Monitoring, Atmospheric Measurement Techniques. 10.5194/amt-2023-173

2023

220. Huang, W., Wu, C., Gao, L., Gramlich, Y., Haslett, S. L., Thornton, J., Lopez-Hilfiker, F. D., Lee, B. H., Song, J., Saathoff, H., Shen, X., Ramisetty, R., Tripathi, S. N., Ganguly, D., Jiang, F., Vallon, M., Schobesberger, S., Yli-Juuti, T., and Mohr, C., 2023, Variation in chemical composition and volatility of oxygenated organic aerosol in different rural, urban, and remote environments, EGUsphere [preprint].https://doi.org/10.5194/egusphere-2023-1821

219. Madhwal. S., S.N. Tripathi., Bergin, M.H., Bhave, P., B. de Foy., Reddy, T. V. R., Chaudhry, S.K., Jain, V., Garg, N and Lalwani, P., 2023, Evaluation of PM2.5 spatio-temporal variability and hotspot formation using low-cost sensors across urban-rural landscape in Lucknow, India. Atmospheric Environment. https://doi.org/10.1016/j.atmosenv.2023.120302

218. Bhowmik. S. H., S.N. Tripathi., et al., 2023, Contribution of fossil and biomass-derived secondary organic carbon to winter water-soluble organic aerosols in Delhi, India, Science of the Total Environment, 905,167155.https://doi.org/10.1016/j.scitotenv.2023.167155

217. Singh, A., S.N. Tripathi., et al., 2023, Wintertime Oxidation potential of PM2.5 over a big Urban city in the central Indo Gangatic Plain, Science of the Total Environment, 905,167155.https://doi.org/10.1016/j.scitotenv.2023.167155

216. Kohl, M., Lelieveld, J., Chowdhury, S., Ehrhart, S., Sharma, D., Cheng, Y., S. N. Tripathi., Sebastian, M., Pandithurai, G., Wang, H and Pozzer, A., 2023, Numerical simulation and evaluation of global ultrafine particle concentrations at the Earth's surface, accepted for publication in EGUspheres, .https://doi.org/10.1029/2022JE007568

215.Haslett, S. L., Bell, D. M., Kumar, V., Slowik, J. G., Wang, D. S., Mishra, S., Rastogi, N., Singh, A., Ganguly, D., Thornton, J., Zheng, F., Li, Y., Nie, W., Liu, Y., Ma, W., Yan, C., Kulmala, M., Daellenbach, K. R., Hadden, D., Baltensperger, U., Prevot, A. S. H., S. N. Tripathi and Mohr, C., 2023, Nighttime NO emissions strongly suppress chlorine and nitrate radical formation during the winter in Delhi, Atmospheric Chemistry and Physics, 23, 9023–9036.https://doi.org/10.1029/2022JE007568

214.Molina-Cuberos, G.J., Witasse, O., Toledo, D and S.N. Tripathi, 2023, The Low- Altitude Ionosphere of the Ice Giant Planets, Journal of Geophysical Research:Planets, 128, e2022JE007568. https://doi.org/10.1029/2022JE007568

213.Mishra, S., S.N. Tripathi., Kanawade, V. P., Haslett, S.L., Dada, L., Ciarelli, G., Kumar,V., Singh, A., Bhattu, D., Rastogi, N., Daellenbach, K.R., Ganguly, D., Gargava,P.,     Slowik, J.G., Kulmala, M., Mohr, C., Imad El-Haddad and Prevot, A.S.H, 2023, Rapid    night-  time nanoparticle growth in Delhi driven by biomass-burning emissions, Nature      geoscience, 16, 224–230, https://doi.org/10.1038/s41561-023-01138-x

212.Jain, V., S.N. Tripathi., Tripathi, N., Gupta, M., Sahu, L.K., Murari, V., Gaddamidi, S., Shukla, A.K and Prevot, A.S.H., 2023, Real-time measurements of NMVOCs in the central IGB, Lucknow, India: Source characterization and their role in O3 and SOA formation, Atmospheric Chemistry and Physics.https://doi.org/10.5194/acp-23-3383-2023

211. Ghosh, S., Dey, S., Das, S., Riemer, N., Giuliani, G., Ganguly, D., Venkataraman, C., Giorgi, F., S.N. Tripathi., Ramachandran, S., Rajesh, T. A., Gadhavi, H., and Srivastava, A. K., 2023, Towards an improved representation of carbonaceous aerosols over the Indian monsoon region in a regional climate model: RegCM, Geoscientific Model Development, 16, 1–15. https://doi.org/10.5194/gmd-16-1-2023

2022

210. Mukherjee, A., S.N. Tripathi., Kirpa, R and Saha, D., 2022, New Delhi air potentially chokes from groundwater conservation policies in adjoining regions, Environmental Science & Technology Letters. https://doi.org/10.1021/acs.estlett.2c00848

209. Khatri., P., Hayasaka, T., Holben, B.N., Singh, R.P., Letu, H and S.N. Tripathi., 2022, Increased aerosols can reverse Twomey effect in water clouds through radiative pathway, Scientific Reports, 12, 20666. https://doi.org/10.1038/s41598-022-25241-y

208. Sreekanth, V., Ajay, R., Padmavati, K., Puttaswamy, N., Prabhu, V., Agrawal, P., Upadhya, A., Rao, S., Sutaria, R., Suman, M., Dey, S., Khaiwal, R., Balakrishnan, K., S.N. Tripathi and Singh, P, 2022, Inter-versus Intra-city variation in the performance and calibration of low-cost PM2.5 sensor: A Multicity assessment in India, ACS Earth and Space Chemistry. https://doi.org/10.1021/acsearthspacechem.2c00257

207. Shukla, A.K., S.N. Tripathi., Canonaco, F., Lalchandani, V., Sahu, R., Srivastava, D, Dave, J., Thamban, M. N., Gaddamidi, S., Sahu, L., Kumar, M., Singh, V and Rastogi, N., 2022, Spatio-temporal variation of C-PM2.5 (composition based PM2.5) sources using PMF*PMF (double-PMF) and single-combined PMF technique on real-time non-refractory, BC and elemental measurements during post- monsoon and winter at two sites in Delhi, India, Atmospheric Environment, https://doi.org/10.1016/j.atmosenv.2022.119456

206. Puthussery, J.V., Dave, J., Shukla, A., Gaddamidi, S., Singh, A., Vats, P., Salana, S., Ganguly, D., Rastogi, N., S.N.Tripathi and Verma V., 2022, Effect of biomass burning, Diwali fireworks, and polluted fog events on the oxidative potential of fine ambient particulate matter in Delhi, India, Environmental Science & Technology . https://doi.org/10.1021/acs.est.2c02730

205. Bhowmik, H.S., S. N. Tripathi., Sahu, R., Shukla, A.K., Lalchandani, V., Talukdar, S., Tripathi, N and Sahu, 2022, Insights into the regional transport and local formation of Secondary Organic Aerosol in Delhi, India, Aerosol and Air Quality Research .https://doi.org/10.4209/aaqr.220113

204. Tripathi, N., Sahu, L.K., S.N. Tripathi, 2022, Characteristics of VOC composition at urban and suburban sites of New Delhi, India in winter, Journal of Geophysical Research, DOI: ttps://doi.org/10.1016/j.apr.2022.101428

203. Manchanda. C., Kumar, M., Singh, V., Hazarika, N., Faisal, M., Lalchandani, V., Shukla, A.,  Dave, J., Rastogi, N and S.N. Tripathi, 2022, Chemical speciation and source apportionment  of ambient PM2.5 in New Delhi before, during, and after the Diwali fireworks, Atmospheric        Pollution Research, 13, 101428, DOI: ttps://doi.org/10.1016/j.apr.2022.101428

202. Jain, V., S. N. Tripathi., Tripathi, N., Sahu, L., Gaddamidi, S., Kumar Shukla, A.S., Bhattu, D and Ganguly, D, 2022, Seasonal variability and source apportionment of non-methane VOCs using PTR-TOF-MS measurements in Delhi, India, Atmospheric  Environment , Volume 283, 119163, DOI: https://doi.org/10.5194/amt-2021-191

201. Kumar, S., Mishra, G., Kumar, M., Saud, T., Dwivedi, A.K., Kumar, S and S.N. Tripathi, 2022 , Response of PDPA to optical materials and thickness of test section window, Measurements,197 ,  111317, DOI: https://doi.org/10.5194/amt-2021-191

200. Kumar, V., Giannoukos, S., S.N. Tripathi., et al., 2022, Real-time chemical speciation and source apportionment of organic aerosol components in Delhi, India, using extractive electrospray ionization mass spectrometry, accepted for publication in Atmospheric Chemistry and Physics, DOI: https://doi.org/10.5194/amt-2021-191

199. Bhowmik, H. S., Shukla, A., Lalchandani, V., S.N. Tripathi et al., 2022, Inter-comparison of online and offline methods for measuring ambient heavy and trace elements and water-soluble inorganic ions (NO3−, SO42−, NH4+ and Cl−) in PM2.5 over a heavily polluted megacity, Delhi, Atmospheric Measurement Techniques, DOI: https://doi.org/10.5194/amt-2021-191

198. Mariam., Joshi, M., Khan, A., Mishra, G., S.N. Tripathi and Sapra, B.K., 2022, Experimental estimates of hygroscopic growth of particulate fission product species (mixed Csl-CsOH) with implications in reactor accident safety research, Progress in Nuclear Energy , DOI: https://doi.org/10.5194/amt-2021-191

197. Yadav, K., S. N. Tripathi et al., 2022, Few-shot calibration of low-cost air pollution (PM2.5) sensors using meta-learning ,IEEE Sensors Letters, DOI: 10.1109/LSENS.2022.3168291

196. Sarangi, C., Chakraborty, T.C., S.N. Tripathi et al.,2022, Observations of aerosol–vapor pressure deficit–evaporative fraction coupling over India, Atmospheric Chemistry and Physics, 22, 3615–3629, DOI: https://doi.org/10.5194/acp-22-3615-2022

195. Yadav, Shweta, S.N. Tripathi et al., 2022, Current status of Source apportionment of Ambient Aerosols in India, Atmospheric Environment, https://doi.org/10.1016/j.atmosenv.2022.118987

2021

194. Khatri, P., Hayasaka, T., Holben, B., S. N. Tripathi., Misra, P., Patra, P. K., Hayashida, S and Dumka U. C., 2021, Aerosol loading and radiation budget , perturbations in densely populated and highly polluted Indo-Gangetic Plain by COVID-19: Influences on cloud properties and air temperature. Geophysical Research Letters, 48, e2021GL093796DOI: 10.1029/2021JD035232.

193. Lalchandani, V., D. Srivastava, S.N. Tripathi et al., 2021, Effect of biomass burning on the PM2.5 composition and secondary aerosol formation during post-monsoon and winter haze episodes in Delhi, Journal of Geophysical Research - Atmospheres,127, DOI: 10.1029/2021JD035232.

192. Jangid, Manish, Amit K. Mishra, S.N. Tripathi et al., 2021, Observation of aerosol induced ‘lower tropospheric cooling’ over Indian core monsoon region, , Environmental Research Letters, 16, 124057, DOI: 10.1088/1748-9326/ac3b7a.

191. Talukdar, S., S.N. Tripathi et al., 2021, Air Pollution in New Delhi during Late Winter: An Overview of a Group of Campaign Studies Focusing on Composition and Sources, Atmosphere, 12, 1432, DOI: 10.3390/atmos12111432

190. Ginn, O., S.N. Tripathi et al., 2021, Detection and quantification of enteric pathogens in aerosols near open wastewater canals in cities with poor sanitation, Environmental Science and Technology, 55, 14758-14771, DOI: 10.1101/2021.02.14.21251650.

189. Khatri, P., S.N. Tripathi et al., 2021, Aerosol Loading and Radiation Budget Perturbations in Densely Populated and Highly Polluted Indo-Gangetic Plain by COVI D-19: Influences on Cloud Properties and Air Temperature, Geophysical Research Letters,48, DOI: 10.1029/2021GL093796.

188. Jha, S.K., Mohit Kumar, S.N. Tripathi, et al., 2021, Domain adaptation based deep calibration of low-cost PM2.5 sensors, IEEE Sensor Journal, DOI: 10.1109/JSEN.2021.3118454

187. Thamban, N., S. N. Tripathi et al., 2021, Evolution of size and composition of fine particulate matter in the Delhi megacity during later winter, Atmospheric Environment, 207, 118752, DOI: 10.1016/j.atmosenv.2021.118752.

186. Niranjan, R., K.P. Mishra, S.N. Tripathi and A.K. Thakur, 2021, Proliferation of lung Epithelial cells is regulated by the mechanisms of autophagy upon exposure of soots, Frotiers in Cell and Developmental Biology, 9:662597, DOI: 10.3389/fcell.2021.662597.

185. Shukla, A.K., V. Lalchandani, S.N. Tripathi et al., 2021, Real-time quantification and source apportionment of fine particulate matter including organics and elements in Delhi during summertime, Atmospheric Environment, 261, 118598, DOI: 10.1016/j.atmosenv.2021.118598.

184. Rastogi, N., Rangu Satish, S.N. Tripathi et al., 2021, Diurnal variability in the spectral characteristics and sources of water-soluble brown carbon aerosols over Delhi, Science of the Total Environment, 794, 148589, DOI: 10.1016/j.scitotenv.2021.148589.

183. Mishra, G., S.N. Tripathi et al., 2021, Interaction of cesium bound fission product compounds (CsI and CsOH) with abundant inorganic compounds of atmosphere: Effect on hygroscopic growth properties, Journal of Hazardous Materials, 418, 126356, DOI: 10.1016/j.jhazmat.2021.126356.

182. Ghosh K., S.N. Tripathi et al., 2021, Effect of charge on aerosol microphysics of particles emitted from a hot wire generator: Theory and experiments, Aerosol Science & Technology, DOI: 10.1080/02786826.2021.1931011.

181. Manchanda, C., M. Kumar, S.N. Tripathi et al., 2021,Variation in chemical composition and sources of PM2.5 during the COVID-19 lockdown in Delhi, Environmental International, 153, 106541, DOI: 10.1016/j.envint.2021.106541.

180. Mishra, G., K. Ghosh, S.N. Tripathi et al., 2021, An application of probability density function for the analysis of PM2.5 concentration during the COVID-19 lockdown period, Science of the Total Environment, 782, 146681, DOI: 10.1016/j.scitotenv.2021.146681.

179. Vohra, Karn, S.N. Tripathi et al., 2021, Long-term trends in air quality in major cities in the UK and India: A view from space, Atmospheric Chemistry and Physics, 21, 6275-6296: doi: 10.5194/acp-21-6275-2021.

178. Singh, Atinderpal, Neeraj Rastogi, S.N. Tripathi et al., 2021, Sources and characteristics of light-absorbing fine particulates over Delhi through the synergy of real-time optical and chemical measurements, Atmospheric Environment, accepted for publication, 252, 118338, DOI: 10.1016/j.atmosenv.2021.118338.

177. Ram, K., Thakur, R.C., S.N. Tripathi et al., 2021, Why airborne transmission hasn’t been conclusive in case of COVID-19? An atmospheric science perspective, Science of the Total Environment, 773, 145525, DOI: 10.1016/j.scitotenv.2021.145525.

176. Lalchandani, V., V. Verma, S.N. Tripathi et al., 2021, Real-time characterization and source apportionment of fine particulate matter in the Delhi megacity area during late winter, Science of the Total Environment, 770, 145324, DOI: 10.1016/j.scitotenv.2021.145324.

175. Upadhyaya, D., J. Evans, S.N. Tripathi et al., 2021, The Indian COSMOS Network (ICON): validating remotely sensed and modelled soil moisture data products, Remote Sensing, 13(3), 537, DOI: 10.3390/rs13030537.

174. Ginn, O., D. Berendes, S.N. Tripathi et al., 2021, Open waste canals as potential sources of antimicrobial resistance genes in aerosols in urban Kanpur, India, American Journal of Tropical Medicine & Hygiene, 104(5), 1761-1767, DOI: 10.4269/ajtmh.20-1222.

173. Rai, P., S.N. Tripathi et al., 2021, Highly time-resolved measurements of element concentrations in PM10 and PM2.5: Comparison of Delhi, Beijing, London, and Krakow, Atmospheric Chemistry and Physics, 21, 717–730, DOI: 10.5194/acp-21-717-2021.

172. Bhowmik, H.S., S. Naresh, S.N. Tripathi et al., 2021,Temporal and spatial variability of carbonaceous species (EC; OC; WSOC and SOA) in PM2.5 aerosol over five sites of Indo-Gangetic Plain, Atmospheric Pollution Research, 12, 375-390, DOI: 10.1016/j.apr.2020.09.019.

2020

171. Goel, V., S.N. Tripathi et al., 2020, Variations in black carbon concentration and sources during COVID-19 lockdown in Delhi, Chemosphere, 270, 129435, DOI: 10.1016/j.chemosphere.2020.129435.

170. Choudhury, G., S.N. Tripathi et al., 2020, Aerosol-enhanced high precipitation events near the Himalayan foothills, Atmospheric Chemistry and Physics, 20, 15389-15399, DOI: 10.5194/acp-20-15389-2020.

169. Sahu, R., S.N. Tripathi et al., 2020, Robust statistical calibration and characterization of portable low-cost air quality monitoring sensors to quantify real-time O3 and NO2 concentrations in diverse environments, Atmospheric Measurement Techniques, 14, 37-52, DOI: /10.5194/amt-14-37-2021.

168. McNeill, J., S.N. Tripathi et al., 2020, Large global variations in measured airborne metal concentrations driven by anthropogenic sources, Scientific Reports, 10, Article number: 21817, DOI: 10.1038/s41598-020-78789-y.

167. Gautam, A.S., S.N. Tripathi et al., 2020, First surface measurement of variation of Cloud Condensation Nuclei (CCN) concentration over the Pristine Himalayan region of Garhwal, Uttarakhand, India, Atmospheric Environment, 246, 118123, DOI: 10.1016/j.atmosenv.2020.118123.

166. Tobler, A., S.N. Tripathi et al., 2020, Chemical characterization of PM2.5 and source apportionment of organic aerosol in New Delhi, India, Science of the Total Environment, 745, 140924, DOI: 10.1016/j.scitotenv.2020.140924.

165. Johnson, A., J.M. Brown, O. Ginn, S.N. Tripathi et al., 2020, Extended-spectrum beta-lactamase (ESBL)-positive Escherichia coli presence in urban aquatic environments in Kanpur, India, Journal of Water and Health, 18 (5), 849–854, DOI: 10.2166/wh.2020.065.

164. Sembhi, H., M. Wooster, S.N. Tripathi et al., 2020, Post-monsoon air quality degradation across Northern India: assessing the impact of policy-related shifts in timing and amount of crop residue burnt, Environmental Research Letters, 15, 104067, DOI: 10.1088/1748-9326/aba714.

163. Wang, L., Jay G. Slowik, S.N. Tripathi et al., 2020, Source characterization of volatile organic compounds measured by PTR-ToF-MS in Delhi, India, Atmospheric Chemistry and Physics, 20, 9753-9770, DOI: 10.5194/acp-20-9753-2020.

162. Rai, P., Markus Furger, S.N. Tripathi et al., Real-time measurement and source apportionment of elements in Delhi's atmosphere, Science of the Total Environment, 741, 140332, DOI: 10.1016/j.scitotenv.2020.140332.

161. Puthussery, J., A. Singh, S.N. Tripathi et al., Real-time measurements of PM2.5 oxidative potential using dithiothreitol (DTT) assay in Delhi, India, Environmental Science & Technology, Letters, 7, 504-510, DOI: 10.1021/acs.estlett.0c00342.

160. Singh, R.K. and S.N. Tripathi, 2020, Application of National Aerosol Facility (NAF) in designing of a ventilation system forisolation rooms to minimize interpersonal exposure of sneezing/coughing, Transactions of the Indian National Academy of Engineering, DOI: 10.1007/s41403-020- 00102-0.

159. Kanawade, V.P., S.N. Tripathi et al., Chemical characterisation of sub–micron aerosols during new particle formation in an urban atmosphere, Aerosol and Air Quality Research, 20: 1294–1305. DOI: 10.4209/aaqr.2019.04.0196

158. Dwivedi, A.K., Manish Kumar, S.N. Tripathi et al., 2020, Optimization of controlling parametersof plasma torch aerosol generator and characteristics of synthesized metal oxide aerosols in context of NAF program, Progress in Nuclear Energy, 123, 103311, DOI: 10.1016/j.pnucene.2020.103311.

157. Sahu, R., Kuldeep K. Dixit, S.N. Tripathi et al., 2020, Validation of low-cost sensors in measuring real-time Validation of low-cost sensors in measuring real-time PM10 concentration at two sites in Delhi national capital region, Sensors, 20, 1347, DOI:10.3390/s20051347.

156. Mishra, G., S.N. Tripathi et al., 2020, Study on CCN activity of fission product aerosols (CsI and CsOH) and their effect on size and other properties, Atmospheric Research, 236, DOI:10.1016/j.atmosres.2019.104816.

155. Mandariya, A.K., S.N. Tripathi et al., 2020, Wintertime hygroscopic growth factors (HGFs) of accumulation mode particles and their linkage to chemical composition in a heavily polluted urban atmosphere of Kanpur at the centre of IGP, India: Impact of ambient relative humidity, Science of the Total Environment, 704, DOI: 10.1016/j.scitotenv.2019.135363.

2019

154. Bhat, G.S., S.N. Tripathi et al., Spatial and temporal variability in energy and water vapor fluxes observed at seven sites on the Indian subcontinent during 2017, Quarterly Journal of Meteorological Society , 1-14, DOI:10.1002/qj.3688, 2019.

153. Ghosh, K., S.N. Tripathi et al., 2019, Particle formation from vapors emitted from glowing wires: Theory and experiments, Aerosol Science & Technology, 54(3), 243-261, DOI: 10.1080/02786826.2019.1688758.

152. Zheng, T., S.N. Tripathi et al., Gaussian Process regression model for dynamically calibrating and surveilling a wireless low-cost particulate matter sensor network in Delhi, Atmospheric Measurement and Techniques , 12(9), 5161–5181, DOI: 10.5194/amt-12-5161-2019, 2019.

151. Brauer, M., S.K. Guttikunda, S.N. Tripathi et al., Examination of monitoring approaches for ambient air pollution: A case study for India Article Type: VSI: Filling the data gaps corresponding, Atmospheric Environment, 216, 116940, DOI: 10.1016/j.atmosenv.2019.116940, 2019.

150. Turner, A, S.N. Tripathi et al., Interaction of convective organisation with monsoon precipitation, atmosphere, surface and sea: The 2016 INCOMPASS field campaign in India , Quarterly Journal of the Royal Meteorological Society, 1-25, DOI: 10.1002/qj.3633, 2019.

149. Choudhury, G., Bhishma Tyagi, S.N. Tripathi et al., Aerosol-orography-precipitation - A critical assessment, Atmospheric Environment, 214, 116831, DOI: 10.1016/j.atmosenv.2019.116831, 2019

148. Brattich, E., E. Serranocastillo, S.N. Tripathi et al., Measurements of aerosols and charged particles on the BEXUS18 stratospheric balloon, Annales Geophysicae , 37, 389-403, DOI: 10.5194/angeo-37-389-2019, 2019.

147. Dwivedi, A.K., A. Khan, S.N. Tripathi et al., Aerosol depositional characteristics in piping assembly under varying flow conditions, Progress in Nuclear Energy, 116, 148-157, DOI: 10.1016/j.pnucene. 2019.04.007, 2019.

146. Thamban, N.M., B. Joshi, S.N. Tripathi et al., Evolution of aerosol size and composition in the Indo-Gangetic plain: Size-resolved analysis of high-resolution aerosol mass spectra , ACS Earth and Space Chemistry , DOI: 10.1021/acsearthspacechem.8b00207, 2019.

145. Mishra, G., A.K. Mandariya, S.N. Tripathi et al., Hygroscopic growth of CsI and CsOH particles in context of nuclear reactor accident research, Journal of Aerosol Science , 132, 60-69, DOI:10.1016/j.jaerosci.2019.03.008, 2019.

144. Mandariya, A.K., T. Gupta and S.N. Tripathi, Effect of aqueous-phase processing on the formation and evolution of Organic Aerosol (OA) under different stages of fog life cycles, Atmospheric Environment , 206, 60-71, DOI: 10.1016/j.atmosenv.2019.02.047, 2019.

143. Zhang, S.Y., S.N. Tripathi et al., Intensive allochthonous inputs along the Ganges River and their effect on microbial community composition and dynamics, Environmental Microbiology, 21(1), 182-196, DOI: 10.1111/1462-2920.14439, 2019.

2018

142. Weagle, C.L., G. Snider, S.N. Tripathi et al., 2018, Global sources of fine particulate matter: Interpretation of PM2.5 chemical composition observed by SPARTAN using a global chemical transport model,Environmental Science & Technology, 52 (20), 11670-11681, DOI: 10.1021/acs.est.8b01658, 2018.

141. Sarangi, C., Vijay P. Kanawade, S.N. Tripathi et al., Aerosol-induced intensification of cooling effect of clouds during Indian summer monsoon, Nature Communication, 9, DOI:10.1038/s41467-018-06015-5, 2018.

140. Zheng, T., S.N. Tripathi et al., 2018, Field evaluation of low-cost particulate matter sensors in high and low concentration environments, Atmospheric Measurement Techniques, 11(8), 4823–4846, DOI: 10.5194/amt-11-4823-2018, 2018.

139. Chakraborty, T., C. Sarangi, S.N. Tripathi et al., 2018, " Biases in model-simulated surface energy fluxes during the Indian monsoon onset period", Boundary-Layer Meteorology, 170(2), 323-348, DOI:10.1007/s10546-018-0395-x, 2018.

138. Trent, M, R.  Dreibelbis, A. Bir, S.N. Tripathi et al., Access to household water quality information leads to safer water: a cluster randomized controlled trial in India, Environmental Science & Technology, 52(9), 5319-5329, DOI: 10.1021/acs.est.8b00035, 2018.

137. Sarangi, C., S.N. Tripathi et al., Aerosol and urban land use effect on rainfall around cities in Indo-Gangetic Basin from observations and cloud resolving model simulations, Journal of Geophysical Research – Atmospheres, 123, 3645-3667, DOI: 10.1002/2017JD028004, 2018.

136. George, G, C. Sarangi, S.N. Tripathi, T. Chakraborty and A. Turner, Vertical structure and radiative forcing of monsoon clouds over Kanpur during the 2016 INCOMPASS field campaign, Journal of Geophysical Research – Atmospheres, 123, 2152-2174, DOI: 10.1002/2017JD027759, 2018.

135. Chakraborty, A., S.N. Tripathi et al., Realtime chemical characterization of post monsoon organic aerosols in a polluted urban city: sources, composition, and comparison with other seasons, Environmental Pollution, 232, 310-321, DOI: 10.1016/j.envpol.2017.09.079, 2018.

134. Shamjad, P.M., S.N. Tripathi et al., Absorbing refractive index and direct radiative forcing of atmospheric brown carbon over Gangetic Plain, ACS Earth and Space Chemistry, 2(1), 31-37, DOI: 10.1021/acsearthspacechem.7b00074, 2018.

133. Holben, B.N., S.N. Tripathiet al., An overview of mesoscale aerosol processes, comparison and validation studies from DRAGON networks, Atmospheric Chemistry and Physics, 18, 655-671, DOI: 10.5194/acp-18-655-2018, 2018.

2017

132. Mhawish,   A., T. Banerjee, D.M. Broday, A. Misra and S.N. Tripathi, Evaluation of MODIS collection 6 aerosol retrieval algorithms over Indo-Gangetic Plain:  Implications of aerosols types and mass loading, Remote Sensing of Environment, 201, 297-313., DOI: 10.1016/j.rse.2017.09.016, 2017.

131. Thamban, N. M., S.N. Tripathiet al., Internally mixed black carbon in the Indo-Gangetic Plain and its effect on absorption enhancement, Atmospheric Research, 197, 211-223, DOI: 10.1016/j.atmosres.2017.07.007, 2017.

130. Lal, S., S. Venkataramani, S.N. Tripathi et al., Loss of crop yields in India due to surface ozone: An estimation based on a network of observations, Environmental Science and Pollution Research, 24(26), 20972-20981, DOI: 10.1007/s11356-017-9729-3., 2017.

129. Mishra, S.K., N. Saha, S.N. Tripathi et al., Morphology, mineralogy and mixing of individual atmospheric particles over Kanpur (IGP): Relevance of homogeneous equivalent sphere approximation in radiative models, MAPAN-Journal of Metrology Society of India, 32(3), 229-241, DOI: 10.1007/s12647-017-0215-7,2017.

128. Satish, R., P. Shamjad, N. Thamban, S.N. Tripathi and N. Rastogi, Temporal characteristics of brown carbon over the central Indo-Gangetic Plain, Environmental Science & Technology, 51(12), 6765–6772, DOI: 10.1021/acs.est.7b00734, 2017

127. Chowdhury, S., S. Dey, S.N. Tripathi et al., “Traffic intervention” policy fails to mitigate air pollution in megacity Delhi, Environmental Science and Policy, 74, 8-13, DOI: 10.1016/j.envsci.2017.04.018, 2017.

126. Sarangi, C., S.N. Tripathi et al., Investigation of aerosol-cloud-rainfall association over Indian Summer Monsoon region, Atmospheric Chemistry and Physics, 17, 5185–5204, DOI: 10.5194/acp-17-5185-2017,2017.

125. Dimri, A.P., S.N. Tripathi et al., Cloudbursts in Indian Himalayas: A review, Earth Science Reviews, 168, 1-23, DOI: 10.1016/j.earscirev.2017.03.006, 2017.

124. Yu, H., L. Dai, Y. Zhao, V.P. Kanawade, S.N. Tripathi et al., Laboratory observations of temperature and humidity dependencies of nucleation and growth rates of sub-3 nm particles, Journal of Geophysical Research - Atmospheres, 122(3), 1919-1929, DOI: 10.1016/j.earscirev.2017.03.006, 2017.

123. Soni, P., S.N. Tripathi and R. Srivastava, Radiative effects of black carbon aerosols on Indian monsoon: A study using WRF-Chem model, Theoretical and Applied Climatology, 132(1-2), 115-134, DOI: 10.1007/s00704-017-2057-1, 2017.

122. Vohra, K., K. Ghosh, S.N. Tripathi et al., 2017, Submicron particle dynamics for different surfaces under quiescent and turbulent conditions, Atmospheric Environment, 152, 330-344, DOI: 10.1016/j.atmosenv.2016.12.013, 2017.

121. Chakraborty, A, S.N. Tripathi and T. Gupta, Effect of organic aerosol loading and fog processing on organic aerosol volatility, Journal of Aerosol Science, 105, 73-83, DOI: 10.1016/j.jaerosci.2016.11.015, 2017.

120. Ghosh, K., S.N. Tripathi et al., Modeling studies on coagulation of charged particles and comparison with experiment, Journal of Aerosol Science, 105, 35-47, DOI: 10.1016/j.jaerosci.2016.11.019, 2017

2016

119. Chakraborty, T., C. Sarangi andS.N. Tripathi, Understanding diurnality and inter-seasonality of a sub-tropical urban heat-island, Boundary-Layer Meteorology, 163(2), 287-309, DOI: 10.1007/s10546-016-0223-0, 2016.

118. Shamjad, P.M., S.N. Tripathi, N. Thamban and V. Heidi, Refractive index and absorption attribution of highly absorbing brown carbon aerosols from an Urban Indian City-Kanpur, Scientific Reports 6, 37735, DOI: 10.1038/srep37735, 2016.

117. Cardnell, S., S.N. Tripathi, et al., A photochemical model of the dust-loaded ionosphere of Mars, , Journal of Geophysical Research–Planets, 121(11), 2335-2348, DOI: 10.1002/2016JE 005077, 2016.

116. Sen, I. S., S.N. Tripathi, et al., Emerging Airborne Contaminants in India: Platinum group elements from catalytic converters in motor vehicles, Applied Geochemistry, 75, 100-106, DOI: 10.1016/j.apgeochem.2016.10.006, 2016.

115. Vreeland, H., J.J. Schauer, A.G. Russell, S.N. Tripathi et al., Chemical characterization and toxicity of particulate matter emissions from roadside trash combustion in urban India, Atmospheric Environment, 147, 22-30, DOI: 10.1016/j.atmosenv.2016.09.041, 2016.

114. Lal, R. M., A. Nagpure, L. Luo, S.N. Tripathi, et al., Municipal solid waste and dung cake burning: Discoloring the Taj Mahal and human health impacts in Agra, Environmental Research Letters, 11, 104009, DOI: 10.1088/1748-9326/11/10/104009, 2016.

113. Kumar, B., A. Chakraborty, S.N. Tripathi and D. Bhattu, Highly time resolved chemical characterization of submicron organic aerosols at a polluted urban location, Environmental Science: Processes & Impacts, 18, 1285, DOI: 10.1039/c6em00392c, 2016

112. Chakraborty, A., S.N. Tripathi and T. Gupta, Combined effects of organic aerosol loading and fog processing on organic aerosols oxidation, composition, and evolution,  Science of the Total Environment, 573, 690-698, DOI: 10.1016/j.scitotenv.2016.08.156,2016

111. Bhattu, D., S.N. Tripathi and A. Chakraborty, Deriving aerosol hygroscopic mixing state from size-resolved CCN activity and HR-ToF-AMS measurements,  Atmospheric Environment, 142, 57-70, DOI: 10.1016/j.atmosenv.2016.07.032, 2016

110. Misra, A., V. P. Kanawade, and S.N. Tripathi, Quantitative assessment of AOD from 17 CMIP5 models based on satellite derived AOD over India, Annales Geophysicae, 34, 657-671, DOI: 10.5194/angeo-34-657-2016, 2016.

109. Snider, G., S.N. Tripathi et al., Variation in global chemical composition of PM2.5: Emerging results from SPARTAN, Atmospheric Chemistry and Physics, 16, 9629-9653, DOI: 10.5194/acp-16-9629-2016, 2016.

108. Sarangi, C., S.N. Tripathi, A. K, Mishra et al., Elevated aerosol layers and their radiative impact over Kanpur during monsoon onset period,  Journal of Geophysical Research–Atmospheres, 121, 7936-7957, DOI: 10.1002/2015JD024711, 2016

107. Chakraborty, A., T. Gupta and S.N. Tripathi, Chemical composition and characteristics of ambient aerosols and rainwater residues during Indian summer monsoon: Insight from aerosol mass spectrometry, Atmospheric Environment, 136, 144-155, DOI: 10.1016/j.atmosenv.2016.04.024, 2016.

106. Chakraborty, A., B. Ervens, T. Gupta and S.N. Tripathi, Characterization of organic residues of size-resolved fog droplets and their atmospheric implications,  Journal of Geophysical Research, 121, 4317-4332, DOI: 10.1002/2015JD024508, 2016.

105. Harrison, R.G., S.N. Tripathi et al., Applications of electrified dust and dust devil electrodynamics to Martian atmospheric electricity, Space Science Reviews, 203(1-4), 299-345, DOI: 10.1007/s11214-016-0241-8, 2016.

104. Kumar, N., S.N. Tripathi et al., Delhi’s air pollution (Re) distribution and air quality regulations, Environmental Policy and Law, 46(1), 77-86, DOI: 10.3233/EPL-46105, 2016

103. Sen, I.S.,  M. Bizimis, S.N. Tripathi and D. Paul, Lead isotopic fingerprinting of aerosols to characterize the sources of atmospheric lead in an industrial city of India, Atmospheric Environment, 129, 27–33, DOI: 10.1016/j.atmosenv.2016.01.005, 2016.

102. Ram, K., S. Singh, M.M. Sarin, A.K. Srivastava and S.N. Tripathi, Variability in aerosol optical properties over an urban site, Kanpur, in the Indo-Gangetic Plain: A case study of haze and dust events, Atmospheric Research, 174-175, 52-61, DOI: 10.1016/j.atmosres.2016.01.014, 2016.

101. Tiwari, S., P. K. Hopke, D. Thimmaiah, S.N. Tripathi, et al., Nature and sources of ionic species in precipitation across the Indo-Gangetic Plains, India, Aerosol and Air Quality Research, 16(4), 943-957, DOI: 10.4209/aaqr.2015.06.0423, 2016.

2015

100. Arola, A., S.N. Tripathi et al., Direct radiative effect by brown carbon over Indo-Gangetic Plain, Atmospheric Chemistry and Physics, 15(22), 12731-12740, DOI: 10.5194/acp-15-12731-2015, 2015.

99. Sarangi, C., S.N. Tripathi, S. Tripathi and M.C. Barth, Aerosol-cloud associations over Gangetic Basin during a typical monsoon depression event using WRF-Chem simulation,  Journal of Geophysical Research - Atmospheres, 120(20), 10974-10995, DOI: 10.1002/2015JD023634, 2015.

98. Shamjad, P.M., S.N. Tripathi et al., Contribution of brown carbon to direct radiative forcing over the Indo-Gangetic Plain, Environmental Science & Technology, 49 (17), 10474-10481, DOI: 10.1021/acs.est.5b03368, 2015.

97. Lalchandani, V., S.N. Tripathi, N. Ramanathan et al., Recommendations for calibration factors for a photo-reference method for aerosol black carbon concentrations, Atmospheric Pollution Research, 7(1), 75-81, DOI: 10.1016/j.apr.2015.07.007, 2015.

96. Chakraborty, A., D. Bhattu, T. Gupta, S.N. Tripathi and M. Canagaratna, Real-time measurements of ambient aerosols in a polluted Indian city: sources, characteristics and processing of organic aerosols during foggy and non-foggy periods, Journal of Geophysical Research – Atmospheres, 120(17), 9006-9019, DOI: 10.1002/2015JD023419, 2015.

95. Kamra, A.K., Singh, D., S.N. Tripathi et al., Atmospheric ions and new particle formation events at a tropical location, Pune, India, Quarterly Journal of Royal Meteorological Society, 141, 3140-3156, DOI: 10.1002/qj.2598, 2015.

94. Chaudhuri, C., S.N. Tripathi, R. Srivastava and A. Misra, Observation- and numerical-analysis-based dynamics of the Uttarkashi cloudburst, Annales Geophysicae, 33(6), 671-686, DOI: 10.5194/angeo-33-671-2015, 2015.

93. Patange, O. S., N. Ramanathan, S.N. Tripathi et al., Reductions in indoor black carbon concentrations from improved biomass stoves in rural India, Environmental Science & Technology, 49(7), 4749-4756, DOI: 10.1021/es506208x, 2015.

92. Snider, G., C.L. Weagle, R.V. Martin, S.N. Tripathi et al., SPARTAN: a global network to evaluate and enhance satellite-based estimates of ground-level particulate matter for global health applications, Atmospheric Measurement Techniques, 8(1), 505-521, DOI: 10.5194/amt-8-505-2015, 2015.

91. Bhattu, D. and S.N. Tripathi, CCN closure study: effects of aerosol chemical composition and mixing state,  Journal of Geophysical Research-Atmospheres, 120, 766-783, DOI: 10.1002/2014JD021978, 2015.

90. Bergin, M.H., S.N. Tripathi et al., The discoloration of the Taj Mahal due to particulate carbon and dust deposition, Environmental Science & Technology, 49 (2), 808-812, DOI: 10.1021/es504005q, 2015, [ Cover Page] [Media Coverage].

89. Villalobos, A.M., S.N. Tripathi et al., Source apportionment of carbonaceous fine particulate matter (PM2.5) in two contrasting cities across the Indo-Gangetic Plain, Atmospheric Pollution Research, 6(3), 398-405, DOI: 10.5094/APR.2015.044, 2015.

2014

88. Gaur, A., S.N. Tripathi et al., Four-year measurements of trace gases (SO2, NOx, CO, and O3) at an urban location, Kanpur, in Northern India, Journal of Atmospheric Chemistry, 71(4), 283-301, DOI 10.1007/s10874-014-9295-8, 2014.

87. Dumka, U.C., Bhattu, D.,  S.N. Tripathi et al., Seasonal inhomogeneity in cloud precursors over Gangetic Himalayan region during GVAX campaign, Atmospheric Research, 155, 158-175, DOI: 10.1016/j.atmosres.2014.11.022, 2014.

86. Kedia, S., S.N. Tripathi et al., Quantification of aerosol type, and sources of aerosols over the Indo-Gangetic Plain, Atmospheric Environment, 98, 607-619, DOI: 10.1016/j.atmosenv.2014.09.022, 2014.

85. Misra, A., A. Gaur, S.N. Tripathi et al., An overview of the physico-chemical characteristics of dust at Kanpur in the central Indo-Gangetic Basin, Atmospheric Environment, 97, 386-396, DOI:  10.1016/j.atmosenv.2014.08.043, 2014.

84. Kanawade, V.P., S.N. Tripathi, et  al., Observations of new particle formation at two distinct Indian subcontinental urban locations, Atmospheric Environment, 90, 370-379, DOI: 10.1016/j.atmosenv.2014.08.001, 2014.

83. Huttunen, J., S.N. Tripathi et al., Effect of water vapour on the determination of Aerosol Direct Radiative Effect based on the AERONET fluxes, Atmospheric Chemistry and Physics, 14(12), 6103-6110, DOI: 10.5194/acp-14-6103-2014, 2014.

82. Kanawade, V. P., S.N. Tripathi, D. Bhattu and P.M. Shamjad, Sub-micron particle number size distributions characteristics at an urban location, Kanpur, in the Indo-Gangetic Plain, Atmospheric Research, 147-148, 121-132, DOI: 10.1016/j.atmosres.2014.05.010, 2014.

81. Mishra, A., M. Michael, S.N. Tripathi, C. Béghin, Revisited modeling of Titan's middle atmosphere electrical conductivity, Icarus, 238, 230-234, DOI: 10.1016/j.icarus.2014.04.018, 2014.

80. Dumka, U.C., S.N. Tripathi, A. Misra, D.M. Giles, T.F. Eck, R. Sagar and B.N. Holben, Latitudinal variation of aerosol properties from Indo Gangetic Plain (IGP) to central Himalayan foothills during TIGERZ campaign, Journal of Geophysical Research-Atmospheres, 119, 4750-4769, DOI: 10.1002/2013JD021040, 2014.

79. Ram, K., S.N. Tripathi, M.M. Sarin and D. Bhattu, Primary and secondary aerosols from an urban site (Kanpur) in the Indo-Gangetic Plain: Influence on CCN, CN concentrations and optical properties, Atmospheric Environment, 89, 655-663, DOI: 10.1016/j.atmosenv.2014.02.009, 2014.

78. Kaul, D.S., T. Gupta and S.N. Tripathi, Source apportionment for water soluble organic matter of submicron aerosol: A comparison between foggy and nonfoggy episodes, Aerosol and Air Quality Research, 14, 1527-3, DOI: 10.4209/aaqr.2013.10.0319, 2014.

77. Bhattu, D. and S.N. Tripathi, Inter-seasonal variability in size-resolved CCN properties at Kanpur, India, Atmospheric Environment, 85, 161-168, DOI: 10.1016/j.atmosenv.2013.12.016, 2014.

76. Ghosh, S. and S.N. Tripathi et al., Chemical characterization of summertime dust events at Kanpur: Insight into the sources and level of mixing with anthropogenic emissions, Aerosol and Air Quality Research, 14, 879-891, DOI: 10.4209/aaqr.2013.07.0240, 2014.

2013

75. Renard, J.B., S.N. Tripathi et al., In situ detection of electrified aerosols in the upper troposphere and stratosphere, Atmospheric Chemistry and Physics, 13, 1-8, DOI: 10.5194/acp-13-7895-2013, 2013.

74. Arola, A., T.F. Eck, S.N. Tripathi et al., Influence of observed diurnal cycles of aerosol optical depth on aerosol direct radiative effect, Atmospheric Chemistry and Physics, 13, 7895-7901, DOI: 10.5194/acp-13-7895-2013, 2013

73. Srivastava, M., S.N. Tripathi, D. Bhattu, et al., CCN closure results from Indian Continental Tropical Convergence Zone (CTCZ) Aircraft experiment, Atmospheric Research, 132-133, 322-331, DOI: 10.1016/j.atmosres.2013.05.025, 2013.

72. Kaskaoutis, D.G., S.N. Tripathi et al., Aerosol properties and radiative forcing over Kanpur during severe aerosol loading conditions, Atmospheric Environment, 79, 7-19, DOI: 10.1016/j.atmosenv.2013.06.020, 2013.

71. Rawal, A., S.N. Tripathi et al., Quantifying the importance of galactic cosmic rays in cloud microphysical processes, Journal of Atmospheric and Solar-Terrestrial Physics, 102, 243-251, DOI: 10.1016/j.jastp.2013.05.017, 2013.

70. Devi, J.J., T. Gupta, R. Jat and S.N. Tripathi, Measurement of personal and integrated exposure to particulate matter and co-pollutant gases: A panel study, Environmental Science and Pollution Research, 20(3), 1632-1648, DOI: 10.1007/s11356-012-1179-3, 2013.

2012

69. Joshi, M., B.K. Sapra, A. Khan, S.N. Tripathi, P.M. Shamjad, T. Gupta, Y.S. Mayya, Harmonisation of nanoparticle concentration measurements using GRIMM and TSI scanning mobility particle sizers, Journal of Nanoparticle Research, 14(12), 1-14, DOI: 10.1007/s11051-012-1268-8, 2012.

68. Choudhry, P., A. Misra and S.N. Tripathi, Study of MODIS derived AOD at three different locations in the Indo Gangetic plain: Kanpur, Gandhi College and Nainital, Annales Geophysicae, 30, 1479-1493, DOI: 10.5194/angeo-30-1479-2012, 2012.

67. Dey, S., L.D. Girolamo, A.V. Donkelaar, S.N. Tripathi, et al., Variability of outdoor fine particulate (PM2.5) concentration in the Indian Subcontinent: A remote sensing approach, Remote Sensing of Environment , 127, 153-161, DOI: 10.1016/j.rse.2012.08.021, 2012.

66. Sawamura, P., S.N. Tripathi et al., Stratospheric AOD after the 2011 eruption of Nabro volcano measured by lidar over the northern hemisphere, Environmental Research Letters , 7(3), 034013, DOI: 10.1088/1748-9326/7/3/034013, 2012.

65. Shamjad, P.M., S.N. Tripathi, S.G. Aggarwal, et al., Comparison of experimental and modeled absorption enhancement by Black Carbon (BC) cored polydisperse aerosols under hygroscopic conditions, Environmental Science & Technology, 46(15), 8082-8089, DOI: 10.1021/es300295v, 2012.

64. Banerjee, S., S.N. Tripathi, U. Das et al., Enhanced persistence of fog under illumination for carbon nanotube fog condensation nuclei, Journal of Applied Physics, 112(2), 024901, DOI: 10.1063/1.4736557, 2012

63. Kaskaoutis, D.G., R.P. Singh, R. Gautam, M. Sharma, P.G. Kosmopoulos and S.N. Tripathi, Variability and trends of aerosol properties over Kanpur, northern India using AERONET data (2001–10), Environmental Research Letters, 7(2), 024003, DOI: 10.1088/1748-9326/7/2/024003, 2012.

62. Mishra S.K., S.N. Tripathi, S, G Aggarwal and A. Arola, Optical properties of accumulation mode, polluted mineral dust: Effects of particle shape, hematite content and semi-external mixing with carbonaceous species, Tellus B:Chemical and Physical Meteorology, 64(1), 18536, DOI: 10.3402/tellusb.v64i0.18536, 2012.

61. Misra, A., S.N. Tripathi, D.S. Kaul and E.J. Welton, Study of MPLNET-derived aerosol climatology over Kanpur, India, and validation of CALIPSO level 2 version 3 backscatter and extinction products, Journal of Atmospheric and Oceanic Technology, 29(9), 1285-1294, DOI: 10.1175/JTECH-D-11-00162.1, 2012.

60. Patidar, V., S.N. Tripathi, P. K. Bharti and T. Gupta, First surface measurement of cloud condensation nuclei over Kanpur, IGP: Role of long range transport, Aerosol Science and Technology, 46, 973-982, DOI: 10.1080/02786826.2012.685113, 2012.

59. Eck, T. F., S.N. Tripathi et al., Fog and cloud induced aerosol modification observed by the Aerosol Robotic Network (AERONET), Journal of Geophysical Research, 117, D07206, DOI: 10.1029/2011JD016839, 2012.

58. Srivastava, A.K., S.N. Tripathi, S. Dey, V.P. Kanawade and S. Tiwari, Inferring aerosol types over the Indo-Gangetic basin from ground based Sunphotometer measurements, Atmospheric Research, 109, 64-75, DOI: 10.1016/j.atmosres.2012.02.010, 2012.

57. Ram, K., M.M. Sarin and S.N. Tripathi, Temporal trends in atmospheric PM2.5, PM10, elemental carbon, organic carbon, water-soluble organic carbon, and optical properties: Impact of biomass burning emissions in the Indo-Gangetic plain,  Environmental Science & Technology , 46(2), 686-695, DOI: 10.1021/es202857w, 2012.

 

2011

56. Devi, J., J., S.N. Tripathi et al., Observation-based 3-Dview of aerosol radiative properties over Indian Continental Tropical Convergence Zone: Implications to regional climate, Tellus, 63B, 971-989, DOI: 10.1111/j.1600-0889.2011.00580.x, 2011.

55. Kaul, D.S., T. Gupta, S.N. Tripathi, V. Tare, J.L. Collett Jr., Secondary organic aerosol: A comparison between foggy and nonfoggy days, Environmental Science & Technology, 45(17), 7307-7313, DOI: 10.1021/es201081d, 2011.

54. Giles, D. M., B.N. Holben, S.N. Tripathi et al., Aerosol properties over the Indo-Gangetic plain: A mesoscale perspective from the TIGERZ experiment, Journal of Geophysical Research, 116, D18203, DOI: 10.1029/2011JD015809, 2011.

53. Srivastava, A. K., S.N. Tripathi et al., Pre-monsoon aerosol characteristics over the Indo-Gangetic Basin: Implications to climatic impact, Annales Geophysicae 29, 789-804, DOI: 10.5194/angeo-29-789-2011, 2011.

52. Kanawade, V.P., S.N. Tripathi et al., Isoprene suppression of new particle formation in mixed deciduous forest, Atmospheric Chemistry and Physics, 11(12), 6013-6027, DOI: 10.5194/acp-11-6013-2011, 2011.

51. Fatima, H., S.N. Tripathi et al., On radiative forcing of sulphate aerosol produced from ion-promoted nucleation mechanisms in an atmospheric global model, Meteorology and Atmospheric Physics, 112(3-4), 101-115, DOI: 10.1007/s00703-011-0138-8, 2011.

50. Dumka, U.C., K. Krishna Moorthy, S.N. Tripathi, P. Hegde and R. Sagar, Altitude variation of aerosol properties over the Himalayan range inferred from spatial measurements, Journal of Atmospheric and Solar-Terrestrial Physics, 73, 1747-1761, DOI: 10.1016/j.jastp.2011.04.002, 2011.

49. Michael, M., S.N. Tripathi, P. Arya, A. Coates, A. Wellbrock and D.T. Young, High-altitude charged aerosols in the atmosphere of Titan, Planetary & Space Sciences, 59(9), 880-885, DOI: 10.1016/j.pss.2011.03.010, 2011, [Media Coverage].

48. Singh, V.P., T. Gupta, S.N. Tripathi, C. Jariwala and U. Das, Experimental study of the effects of environmental and fog condensation nuclei parameters on the rate of fog formation and dissipation using a new laboratory scale fog generation facility, Aerosol and Air Quality Research, 11(2), 140-154, DOI: 10.4209/aaqr.2010.08.0071, 2011.

47. Arola, A., G. Schuster, G. Myhre, S. Kazadzis, S. Dey and S.N. Tripathi, Inferring absorbing organic carbon content from AERONET data, Atmospheric Chemistry and Physics, 11, 215-225, DOI: 10.5194/acp-11-215-2011, 2011.

2010

46. Srivastava, A.K. and S.N. Tripathi, Numerical study for production of space charges within stratiform cloud, Journal of Earth System Science, 119(5), 627-638, DOI: 10.1007/s12040-010-0053-2, 2010.

45. Ram, K., M.M. Sarin, and S.N. Tripathi, A 1 year record of carbonaceous aerosols from an urban site in the Indo-Gangetic plain: Characterization, sources and temporal variability, Journal of Geophysical Research, 115, D24313, DOI:10.1029/2010JD014188, 2010.

44. Eck, T. F., S.N. Tripathi et al., Climatological aspects of the optical properties of fine/coarse mode aerosol mixtures, Journal of Geophysical Research, 115, D19205, DOI:10.1029/2010JD014002, 2010.

43. Ram, K., M.M. Sarin and S.N. Tripathi, Inter-comparison of thermal and optical methods for determination of atmospheric black carbon and attenuation coefficient from an urban location in northern India, Atmospheric Research, 97(3), 335-342, DOI: 10.1016/j.atmosres.2010.04.006, 2010.

2009

42. Baxla, S.P., A.A. Roy, T. Gupta, S.N. Tripathi and R. Bandyopadhyaya, Analysis of diurnal and seasonal variation of submicron outdoor aerosol mass and size distribution in a northern Indian city and its correlation to black carbon, Aerosol and Air Quality Research, 9, 458-469, DOI: 10.4209/aaqr.2009.03.0017, 2009.

41. Nakajima, T. Y., T. Nakajima, K. Yoshimori, S.K. Mishra and S.N. Tripathi, Development of a light scattering solver applicable to particles of arbitrary shape on the basis of the surface-integral equations method of Muller-type (SIEM/M): Part 1. Methodology, accuracy of calculation and electromagnetic current on the particle surface, Applied Optics, 48(19), 3526-3536, DOI: 10.1364/AO.48.003526, 2009.

40. Ganguly, D., P. Ginoux, V. Ramaswamy, D.M. Winker, B.N. Holben and S.N. Tripathi, Retrieving the composition and concentration of aerosols over the Indo-Gangetic basin using CALIOP and AERONET data, Geophysical Research Letters, 36, L13806, DOI:10.1029/2009GL038315, 2009.

39. Devi, J.J., T. Gupta, S.N. Tripathi and K. K. Ujinwal, Assessment of personal exposure to inhalable indoor and outdoor particulate matter for student residents of an academic campus (IIT-Kanpur), Inhalation Toxicology, 21(14), 1208-1222, DOI: 10.3109/08958370902822875, 2009.

38. Michael, M., S.N. Tripathi, W. Borucki and R.C. Whitten, Highly charged cloud particles in the atmosphere of Venus, Journal of Geophysical Research (Planets), 114(E4), EO4008, DOI:10.1029/2008JE003258, 2009. Amongst the five top most downloads during the first week of publication (April 30, 2009).

37. Mehta B., C. Venkataraman, M. Bhushan and S.N. Tripathi, Identification of sources affecting fog formation using receptor modeling approaches and inventory estimates of sectoral emissions, Atmospheric Environment, 43(6), 1288-1295, DOI: 10.1016/j.atmosenv.2008.11.041,2009.

36. Roy, A. A., S. P. Baxla, T. Gupta, R. Bandyopadhyaya and S.N. Tripathi, Particles emitted from indoor combustion sources: size distribution measurement and chemical analysis, Inhalation Toxicology, 21(10), 837-848, DOI: 10.1080/08958370802538050, 2009.

2008

35. Mishra, S.K., S. Dey and S.N. Tripathi, Implication of particle composition and shape to dust radiative effect: A case study from the Great Indian desert, Geophysical Research Letters, 35(23), L23814, DOI:10.1029/2008GLO36058, 2008.

34. Michael, M. and S.N. Tripathi, Effect of charging of aerosol in the lower atmosphere of Mars during the dust storm of 2001, Planetary and Space Sciences, 56(13), 1696-1702, DOI: 10.1016/j.pss.2008.07.030, 2008.

33. Mishra, S.K. and S.N. Tripathi, Modeling optical properties of mineral dust over the Indian Desert, Journal of Geophysical Research, 113, D23201, DOI:10.1029/2008JD010048, 2008.

32. Michael, M., S.N. Tripathi and S.K. Mishra, Dust charging and electrical conductivity in the day and night-time atmosphere of Mars, Journal of Geophysical Research (Planets), 113(E7), E07010, DOI:10.1029/2007JE003047, 2008, [Media Coverage].

31. Whitten, R.C., W.J. Borucki, K. O'Brien and S.N. Tripathi, Predictions of the electrical conductivity and charging of the cloud particles in Jupiter's atmosphere, Journal of Geophysical Research, 113(E4), E04001, DOI:10.1029/2007JE002975, 2008, [Media Coverage].

30. Dey, S. and S.N. Tripathi, Aerosol direct radiative effects over Kanpur in the Indo-Gangetic basin, northern India: Long-term (2001-2005) observations and implications to regional climate, Journal Geophysical Research, 113(D4), D04212, DOI:10.1029/2007JD009029, 2008.

29. Dey, S., S.N. Tripathi and S.K. Mishra, Probable mixing state of aerosols in the Indo-Gangetic Basin, Northern India, Geophysical Research Letters, 35(3), L03808, DOI:10.1029/2007GL032622, 2008.

2007

28. Tripathi, S.N., A. Pattanaik and S. Dey, 2007, Aerosol indirect effect over Indo-Gangetic plain, Atmospheric Environment, 41(33), 7037-7047, DOI: 10.1016/j.atmosenv.2007.05.007, 2007.

27. Tripathi, S.N., A.K. Srivastava, S. Dey, S.K. Satheesh and K. Krishnamoorthy, 2007, The vertical profile of atmospheric heating rate of black carbon aerosols at Kanpur in northern India, Atmospheric Environment, 41(32), 6909-6915, DOI: 10.1016/j.atmosenv.2007.06.032, 2007.

26. Sharma, M., S. Kishore, S.N. Tripathi and S.N. Behera, Role of atmospheric ammonia in the formation of inorganic secondary particulate matter:  A Study at Kanpur, India,  Journal of Atmospheric Chemistry, 58, 1-17, DOI: 10.1007/s10874-007-9074-x, 2007.

25. Nair, V. S., K. Krishnamoorthy, D. P. Alappattu, P. K. Kunhikrishnan, S. George, P. R. Nair, S. Babu, B. Abish, S.K. Satheesh, S.N. Tripathi et al., Wintertime aerosol characteristics over the Indo-Gangetic plain (IGP): Impacts of local boundary layer processes and long-range transport, Journal of Geophysical Research, 112(D13), D13205, DOI:10.1029/2006JD008099, 2007.

24. Whitten, R.C., W.J. Borucki and S.N. Tripathi, Predictions of the electrical conductivity and charging of the aerosols in the Titan's night time atmosphere, Journal of Geophysical Research (Planets), 112(E4), E04001, DOI:10.1029/2006JE002788, 2007.

23. Michael, M., M. Barani and S.N. Tripathi, Numerical predictions of aerosol charging and electrical conductivity of the lower atmosphere of Mars, Geophysical Research Letters, 34(4), L04201, DOI:10.1029/2006GL028434, 2007.

22. Dey, S. and S.N. Tripathi, Estimation of aerosol optical properties and radiative effects in the Ganga basin, northern India, during the winter time, Journal of Geophysical Research, 112(D3), D03203, DOI:10.1029/2006JD007267, 2007.

21. Tripathi, S.N., V. Tare, N. Chinnam et al., Measurements of atmospheric parameters during Indian Space Research Organization Geopshere Biosphere Programme land campaign II at a typical location in the Ganga basin: 1. Physical and optical properties, Journal of Geophysical Research, 111(D23), D23209, DOI:10.1029/2006JD007278, 2006.

20. Tare, V., S.N. Tripathi et al., Measurements of atmospheric parameters during Indian Space Research Organization Geosphere Biosphere Program land campaign II at a typical location in the Ganga basin: 2. Chemical properties, Journal of Geophysical Research, 111(D23), D23210, DOI:10.1029/2006JD007279, 2006.

19. Tripathi, S.N., S. Vishnoi, S. Kumar and R.G. Harrison, Computationally efficient expressions for the collision efficiency between electrically charged aerosol particles and cloud droplets, Quarterly Journal of Royal Meteorological Society, 132(618), 1717-1731, DOI: 10.1256/qj.05.125, 2006.

2006

18. Chinnam, N., S. Dey, S.N. Tripathi and M. Sharma, Dust events in Kanpur, northern India: Chemical evidence for source and implications to radiative forcing,  Geophysical Research Letters, 33(8), L08803, DOI:10.1029/2005GL025278, 2006.

17. Borucki, W.J., R.C. Whitten, E.L.O. Bakes, E. Barth and  S.N. Tripathi, Predictions of the electrical conductivity and charging of the aerosols in the Titan's atmosphere,  Icarus, 181(2), 527-544, DOI: 10.1016/j.icarus.2005.10.030,   2006.

16. Dey, S., S.N. Tripathi, R.P. Singh and B. N. Holben, Retrieval of black carbon and specific absorption over Kanpur city, northern India during 2001-2003 using AERONET data, Atmospheric Environment, 40(3), 445-456, DOI: 10.1016/j.atmosenv.2005.09.053, 2006.

15. Kanawade, V. and S.N. Tripathi, Evidence for the role of ion-induced particle formation during an atmospheric nucleation event observed in Tropospheric Ozone Production about the Spring Equinox (TOPSE), Journal of Geophysical Research, 111(D2), D02209, DOI:1029/2005JD006366, 2006.

2005

14. Tripathi S.N., S. Dey, V. Tare and S.K. Satheesh, Aerosol black carbon radiative forcing at an industrial city in northern India,  Geophysical Research Letters, 32(8), L08802, DOI:10.1029/2005GL022515, 2005.

13. Tripathi, S.N., S. Dey, V. Tare, S.K. Satheesh, S. Lal and S. Venkataramni, Enhanced layer of black carbon in a north Indian industrial city,  Geophysical Research Letters, 32(12), L12802, DOI:10.1029/2005GL022564, 2005.

12. Tripathi, S.N., S. Dey, A. Chandel, S. Srivastava, R.P. Singh and B. N. Holben, Comparison of MODIS and AERONET derived aerosol optical depth over the Ganga basin, India, Annales Geophysicae, 23(4), 1093-1101, DOI: 1432-0576/ag/2005-23-1093, 2005.

11. Modgil, M.S., S. Kumar, S.N. Tripathi and E.R. Lovejoy, A parameterization of ion-induced nucleation of sulphuric acid and water for atmospheric conditions, Journal of Geophysical Research, 110(D19), D19205, DOI: 10.1029/2004JD005475, 2005.

10. Dey, S., S.N. Tripathi, R.P. Singh and B.N. Holben, Seasonal variability of the aerosol parameters over Kanpur, an urban site in Indo-Gangetic basin,  Advances in Space Research, 36(5), 778-782, DOI: 10.1016/j.asr.2005.06.040, 2005.

2004

9. Dey, S., S.N. Tripathi, R.P. Singh and B.N. Holben, Influence of dust storms on the aerosol optical properties over the Indo-Gangetic basin, Journal of Geophysical Research, 109(D20), D20211, DOI:10.1029/2004JD004924, 2004.

8. Singh, R.P., S. Dey, S., S.N. Tripathi, V. Tare and B. Holben, Variability of aerosol parameters over Kanpur, northern India, Journal of Geophysical Research, 109(D23), D23206, DOI:10.1029/2004JD004966, 2004.

2002

7. Tripathi, S.N. and R.G. Harrison, Enhancement of contact nucleation by scavenging of charged aerosol particles, Atmospheric Research, 62(1), 57-70, DOI: 10.1016/S0169-8095(02)00020-0, 2002.

6. Mayya, Y.S., S.N. Tripathi and A. Khan, Boundary conditions and growth of mean charges for radioactive aerosol particles near absorbing surfaces. Journal of Aerosol Science, 33(5), 781-795, DOI:10.1016/S0021-8502(01)00213-0, 2002.

2001

5. Tripathi, S.N. and R.G. Harrison, , Scavenging of electrified radioactive aerosols. Atmospheric Environment, 35(33), 5817-5821, DOI: 10.1016/S1352-2310(01)00299-0, 2001.

Review Article

4. Tripathi, S.N., M. Michael and R.G. Harrison, Profiles of ion and aerosol interactions in planetary atmospheres, Space Science Review, 137(1-4), 193-211, DOI: 10.1007/s11214-008-9418-0, 2008.

Discussion Paper

3. Michael, M., A. Yadav, S.N. Tripathi, V.P. Kanawade, A. Gaur, P. Sadavarte and C. Venkataraman, Simulation of trace gases and aerosols over the Indian Domain: Evaluation of the WRF-Chem model, Atmospheric Chemistry and Physics Discussion, 13, 12287-12336, DOI: 10.5194/gmdd-7-431-2014, 2013.

2. Kaul, D.S., Tarun Gupta and S.N. Tripathi, Chemical and microphysical properties of the aerosol during foggy and nonfoggy episodes: A relationship between organic and inorganic content of the aerosol, Atmospheric Chemistry and Physics Discussion, 12, 14483-14524, DOI:10.5194/acpd-12-14483-2012, 2012.

1. Mishra, S.K., S.N. Tripathi, S.G. Aggarwal and A. Arola, Effects of particle shape, hematite content and semi-external mixing with carbonaceous components on the optical properties of accumulation mode mineral dust,  em>Atmospheric Chemistry and Physics Discussion, 10, 1–48, DOI:10.5194/acpd-10-31253-2010, 2010.

Other Publications

Book Chapter

Meeting Report

Technical Report

Proceedings/Conferences

  • Mishra, S.K. and S.N. Tripathi, Optical properties of mineral dust over the global deserts, International Radiation Symposium, Brazil, August 3-8, 2008.
  • Vivek Pratap, N. Tripathi, S.N. Tripathi, T. Gupta, U. Das, A laboratory investigation of the effects of soluble coating on hydrophobic condensation nuclei on fog visibility, SAM, New Delhi, February 2008.
  • Mishra, S. K. and S.N. Tripathi, Modeling optical properties of mineral dust over Indian desert, ACCLINT,   Ahmedabad, November 2007.
  • Vanga, A., S.N. Tripathi and A. Ghosh, Role of in situ formed new particles in ice nucleation in cirrus clouds, ACCLINT, Ahmedabad, November 2007.
  • Mehta, B., C. Venkataraman, M. Bhushan and S.N. Tripathi, Matrix factorization modeling for air pollution   source identification: Application to field data from Kanpur, IASTA, New Delhi, November, 2007.
  • Jaidevi, J., T. Gupta, S.N. Tripathi and K. K. Ujinwal, Assessment of personal exposure to indoor and  outdoor particulate matter for residents of an academic campus (IIT-Kanpur), IASTA, New Delhi, November, 2007.
  • Dey, S. and S.N. Tripathi, Aerosol radiative effects over Kanpur region, northern India, IASTA, New Delhi, November, 2007.
  • Pratap, V., V. Bharat, N. Tripathi, S.N. Tripathi, T. Gupta, A. Mishra and U. Das, An experimental investigation of the effects of environmental and fog condensation nuclei parameters, IASTA, New Delhi, November, 2007.
  • Dey, S. and S.N. Tripathi, Aerosol and cloud forcing in the Indo-Gangetic plain, AGU Fall Meeting, San Francisco, December 2006.
  • Tripathi, S.N., A. Srivastava and S. Dey, Surface and Aircraft measurements of aerosol black carbon at a typical location in gangetic basin, northern India, AGU Fall Meeting, San Francisco, December 2006.
  • Nakajima, T., S.K. Mishra, S.N. Tripathi and T. Nakajima, Tracing optical-parameters of cirrus clouds containing hexagonal ice-crystals using surface integral equation method of Muller type, SPIE, Goa, November 2006.
  • Dey, S. and S.N. Tripathi, An aerosol model for Ganga basin, Northern India, Western Pacific Joint Meeting (WPJM), Beijing, July 2006.
  • Manar, M., S.N. Tripathi and S. Kishore, Size resolved chemical composition of fog at Kanpur, India, Asian Aerosol Conference, December 2005.
  • Tripathi, S.N., N. Chinnam, A. Srivastava, A. Agarwal, S. Kishore, R. B. Lal, Sagnik Dey, Manish Manar, S. S. Chauhan, V. Tare, R. P. Singh and M. Sharma, Measurements of aerosol parameters during ISRO-GBP  Land campaign-II at Kanpur (Indo-Gangetic Basin)- Part-I- Optical and Physical Properties, Asian Aerosol Conference, December 2005.
  • Srivastava, A. K., S.N. Tripathi, N, Chinnam, Sagnik Dey, M. Manar, Vijay Kanawade, A. Agarwal, S. Kishore,  R. B. Lal, V. Tare and M. Sharma, Measurements of aerosol parameters during ISRO-GBP Land campaign-II at Kanpur (Indo-Gangetic Basin)-Part-II- Chemical Properties, Asian Aerosol Conference, December 2005.
  • Kanawade Vijay and S.N. Tripathi, What triggers particle nucleation during TOPSE atmospheric nucleation event?, Asian Aerosol Conference, December 2005.
  • Tripathi, S.N. and Vijay Kanawade, Evidences for new particle formation in the Arctic as a part of TOPSE atmospheric nucleation event, AGU Fall Meeting, San Francisco, December 2005.
  • Kanawade Vijay and S.N. Tripathi, Model prediction of sulfuric acid in the tropical/subtropical cirrus clouds as a part of Crystal-Face Mission, AGU Fall Meeting, San Francisco, December 2005.
  • Tripathi, S.N., Sanjeev Kumar, M. S. Modgil and E. R. Lovejoy, Parameterization of ion induced nucleation of sulphuric acid and water, AGU Fall Meeting, San Francisco, December 2004.
  • Tripathi, S. N., Sagnik Dey and R. P. Singh, Black carbon absorption over Kanpur (an Industrial City in the Indo-Gangetic Basin) retrieved from AERONET data, AGU Fall Meeting, San Francisco, December 2004.
  • Kanawade Vijay and S.N. Tripathi, Model studies on atmospheric ion induced nucleation of sulfuric acid and water: Interpretation of in situ measurements, First European Space Weather Week, ESTEC, Noordwijk  (The Netherlands), November 29- December 3, 2004.
  • Sanjeev Kumar, Moninder Singh Modgil, S.N. Tripathi, E. R. Lovejoy and Jan Kazil, A parameterization of ion induced nucleation of sulphuric acid and water for atmospheric conditions, 6th International Conference on  Nucleation of Atmospheric Aerosols, July 37-30, Kyoto, Japan.
  • Tripathi, S.N., A. Chandel, S. Srivastava, Sagnik Dey and Ramesh P. Singh, Comparison of satellite derived aerosol parameters with ground measured data over Ganga Basin, Accepted for presentation in National Space Science Seminar, 2004.
  • Borucki, W.J., R.C. Whitten, E.L.O. Bakes and S.N. Tripathi, Electrical charging of the clouds of Titan, presented in AGU Fall meeting in San Fransisco.
  • Tripathi, S.N., R. G. Grainger and H. L. Rogers, A fast microphysical model for stratospheric aerosols,  EGS-AGU-EGU, Nice, April, 2003.
  • Tripathi, S.N. and R. G. Harrison, Radioactive aerosols in the environment, Proceedings of 6th International Electricity Conference, Versailles, France, 2003.
  • Tripathi, S.N., X. Vancassel, R. G. Grainger and H. L. Rogers, A fast microphysical model for stratospheric aerosols, Aviation, Atmosphere and Climate, Proceedings European Conference at DLR, Germany,   310 -315, 2003.
  • Tripathi, S.N. and W. J. Borucki, Charge distribution on Titan aerosol, Bulletin of Indian Aerosol Science and Technology Association, Proc. IASTA-2002 Conference, Thiruvananthapuram, 2002.
  1. Organized a 'A Brainstorming Workshop on Sustainable Cities", March 9, 2024, National Aerosol Facility (NAF), IIT Kanpur.
  2. Organized an online training program on Air Quality Management during February- March 2022, funded by World Bank
  3. Organized North Indian Air Pollution meeting on Zoom, 23-24 August 2020.
  4. Organized IITK-UPPCB workshop on “National Knowledge Network (NKN) to support National
    Clean Air Programme”, Indira Gandhi Pratishthan, Lucknow on October 14-15, 2019. 11.
  5. Organized IITK-PSI workshop on “Early Results from Delhi Air Quality Experiment 2017-18 and
    Future Forward”, India International Centre, New Delhi on October 26-27, 2018.
  6. Organized a DST meeting as National Coordinator for “National Network Programme on Aerosol
    (NNP-A) under Climate Change Programme of DST at Indian Institute of Technology Delhi on
    October 23, 2018.
  7. Organized IITK-MoES workshop on “Real-time Nationwide Low-Cost Sensor Network for Air
    Quality Monitoring” held at Ganga Auditorium, Indira Paryavaran Bhavan, Ministry of Environment,
    Forest and Climate Change, New Delhi on August 29, 2018.
  8. Organized DST-UKIERI workshop on “An Introduction to Earth Observation Techniques:
    Applications to the Land and Atmosphere” held at Indian Institute of Technology Kanpur from March
    26-28, 2018.
  9. Organized DST National Workshop on “Aerosols: Science and Application” as part of proposed
    ‘National Network Programme on Climate Change and Aerosols’ held at Indian Institute of
    Technology-Kanpur, May 11-12, 2017.
  10. Organized DBT-RCUK Workshop: Biological solution to reducing industrial waste, environmental
    inefficiency and pollution in India, organized by Centre for Environmental Science & Engineering
    (CESE), Indian Institute of Technology-Kanpur, March 21-23, 2017.
  11. Organized Theme Meeting on Aerosol Behavior Studies in a Nuclear Reactor under Severe Accident
    Conditions held at Indian Institute of Technology-Kanpur, February 23-25, 2016.
  12. Organised Indo-US workshop on ‘Sources of Environmental Pollution in India: The influence of
    Municipal Solid Waste and Biomass Burning on Air Quality and the Microbiome of the Ganges’ held
    at Indian Institute of Technology-Kanpur, October 25-26, 2015.
  13. Organised IITK-Archaeological Survey of India Joint workshop on ‘Study of Impacts of Atmospheric
    Haze on TajMahal Monument’ under Indo-US Science and technology forum at Indian Institute of
    Technology-Kanpur, February 17, 2012.
  14. Co-Convenor of Tiger-Z (Indo-NASA Joint Field Experiment) workshop held at Indian Institute of
    Technology-Delhi, January 7-8, 2009.
  15. Co-Convenor of biennial conference of Indian Aerosol Science and Technology Association,
    International Conference on ‘Aerosol, Clouds and Indian Monsoon’ held at Indian Institute of
    Technology-Kanpur, November 15-17, 2004.

Organizational Achievements

  1. The Summer School on ‘Sustainable Cities’ was held at Indian Institute of Technology-Kanpur organized by Centre for Environmental Science and Engineering from June 2nd-27th, 2013 in collaboration with Univ. of Minnesota, Georgia Tech, NAE, Yale, NCAR and Univ. Colorado sponsored by USAID and NSF. The school was attended by more than 30 students and Scientists from IITs, collaborators Universities, ROI and ICLEI etc.
  2. An invited DST Training School on ‘Aerosol-Cloud Interaction’ was held at Indian Institute of Technology-Kanpur from 7th-15th March, 2009.The school was attended by more than 25 students and scientists from various IITs, Universities and research laboratories such as NPL, SPL, IITM, IMD etc.

 

  1. Invited talk at “Air Quality Challenges in Indian Cities", Rajasthan Technical University, Kota, March 27, 2024, Titled “Clean Air For Breathable and Livable Cities”.
  2. Invited talk at, INAE Workshop on “Sustainability in Water and Environment", IIT BHU, February 26-27, 2024, titled “AI and Data Driven Approaches to Secure Clean Air for Sustainable Cities”.
  3. Keynote address at National Environmental Conference February 15-17, 2024, IIT Bombay. Talk titled “AI and Data Driven Approaches to Secure Clean Air for Sustainable Cities”.
  4. Keynote Speaker at International Conference on Climate Change and Agroecosystem: Threats, Opportunities and Solutions (INAGMET-2024), BHU, February 8-10, 2024. Talk tiled “Clean Air for Sustainable Agriculture: Air Pollution as a Major Threat to Food Security”.
  5. Invited speaker at INFOSYS PRIZE 2023 - WINNERS’ SYMPOSIUM - EDITION III, 12th January, 2024. Taj West End Hotel Bangalore. Talk titled “Clean Air Technologies for Sustainable Policies & Improved Public Health”.
  6. Invited speaker at Airshed Modelling for Air Quality Management, 04 December 2023, Delhi
  7. Invited talk titled “Opportunities For Researchers To Support Air Quality Action” at National Consultation on Air Pollution and Health in India, AIIMS New Delhi, November 17, 2023
  8. Delivered a talk titled Sustainable and Scalable Technologies for Air Quality   Monitoring at Sustainable and Emerging Technologies for Food Safety and Environmental Toxicology (SET-FEST), October 12-13, 2023, Lucknow
  9. Invited talk on “Scientific & Technological Contributions and Capacity Building Under NCAP”, Golden Jubilee Celebration of West Bengal Pollution Control Board, September 22, 2023.
  10. Invited talk titled “Clean Air and Water For Sustainable Future” at World Environment Day, IISER Kolkata, June 05, 2023
  11. Invited talk titled “Clean Air and Water For Sustainable Future”, Research Scholars' Day 2023, Department of Sustainable Energy Engineering, IIT Kanpur, 01 June 2023
  12. Delivered talk at Aakash Project 2023 Workshop in Delhi, titled Nationwide Air Quality Monitoring Combining Sensors Plus Satellite Images with AI & ML”, March 28-29, 2023, India Habitat Centre, Lodhi Road, Delhi
  13. Invited speaker at Regional (East) Meet of Institutes of Repute Associated with NCAP: Convergence of Knowledge, Institutional Capacity and Infrastructure Building, titled “Nationwide Air Quality Monitoring Combining Sensors Plus Satellite Images with AI & ML”, March 24 and 25, Hotel Chanakya, Patna
  14. Delivered talk at Maharashtra Prathamik Shikshan Parishad (MPSP), titled “Scalable and Affordable Solutions for Hyperlocal Monitoring, Source Attribution and Source Control”, March 18, 2023
  15. Delivered an invited talk at Indian Physics Association (IPA), Prof. P. A. Pandya Endowment Lecture, titled “Nationwide Air Quality Monitoring Combining Sensors Plus Satellite Images With AI & ML”, March 14, 2023, IIT Kanpur
  16. Delivered a Keynote talk titled “Nano particles night time growth :Implications to Haze    and Climate” in the international symposium, Nano -2023 (March 13-14) in Hyderabad.
  17. Delivered a talk, titled, “Combining Sensors plus satellite images with AI&ML for Nationwide Air Quality Monitoring” at One-day symposium on "Demystifying UNFCCC Conference of Parties (CoP) - International Negotiations vs Local Climate Action", 02 March 2023, IIT Kanpur.
  18. Delivered a lecture titled “Real-time Source Apportionment Using Advanced Instruments” at Winter School on Hands on Training on Instrumentation and Analytical Techniques, Central University of Jammu, 20 - 25 February 2023.
  19. Invited talk titled “Hybrid Technologies for Monitoring Particulate Matter, Source  Attribution and Health Impacts at Scale” at Air Quality in Mumbai- A Consultative    Stakeholder Workshop, 12 January 2023, Mumbai.
  20. Invited speaker at Institute Research Symposium (IRS'23), titled talk “Hybrid   Technologies for Monitoring Particulate Matter, Source Attribution and Health Impacts at Scale”, January 07-08, 2023, IIT Kanpur.
  21. Delivered a talk titled “Nation Wide Sensor Based Monitoring and Source Attribution” at UKRI India/NERC Low-Cost Environmental Monitoring (LEMS) Workshop , December 14-15, 2022.
  22. Delivered a talk titled “Changes in Atmospheric Composition: Implication to Global             and Regional Climate and Atmospheric Chemistry” at SUMANGALAM             PANCHAMAHABHOOT,     International conference series on VAYU: THE VITAL            LIFE FORCE, December 3-4, 2022, Siksha ‘o’ Anusandhan (SoA) university,    Bhubaneswar.
  23. Delivered talk titled “Hybrid Technologies for Monitoring Particulate Matter, Source             Attribution and Health Impacts at Scale, Environment and Sustainability Event ,Indian National Science Academy, Delhi, November 6-8, 2022
  24. Delivered a talk titled “Scientific and Technological Solutions for Clean Air” at  a symposium on “India’s Sustainable Future: Challenges and Opportunities vis-à-vis Global Perspectives” organized by Chandrakanta Kesavan Center for Energy Policy and Climate Solutions , IIT Kanpur .
  25. Invited talk titled “Nationwide sensor-based air quality monitoring: From laboratory to field deployments”, at RSC-IITM Desktop Seminar on Environmental Sciences, 11-12 Oct, 2022, organized by Royal society of Chemistry, Environmental Science Journal (RSC) and IIT Madras.
  26. Delivered lecture titled “Clean Air for the Sustainable Future” at Recent Advances in Environmental Engineering towards Sustainability (10-14 Oct, 2022), organized by National Institute of Technology, Patna
  27. Delivered a Keynote talk titled “Capacity Building And Technology Development By Universities In India’s Clean Air Program” at “Friday Colloquium Series at CSIR-NPL, New Delhi, Oct 07, 2022
  28. Invited speaker at “Tech for Impact -Bharat” 2022 meeting organized jointly by Principal Scientific Advisor Office Principal Scientific Adviser to GoI and NIAS, Bengaluru
  29. Invited speaker at Air Sensors International Conference (ASIC), Bangalore, titled “Journey of Sensor Based Air Quality Monitoring in India”. August 26, 2022.
  30. Delivered a talk, titled “Role of National Clean Air Program (NCAP) in Tackling Air Pollution” Storytelling for Environmental Change: Tackling Air Pollution in the World’s Most Polluted City, Jamia Millia Islamia, New Delhi, 22-23 August 2022
  31. Invited talk titled “Capacity Building and Technology Development by Universities             and Research   laboratories In India’s Clean Air Program Capacity Building             Workshop on Air Action Plan, August 22,2022
  32. Invited Speaker at an online conference “Advancing Environmental Innovations In India, Insights from Experimental Research, July 22, 2022, hosted by Energy Policy Institute at the University of Chicago.
  33. Invited talk at Max Planck Institute For Chemistry, Mainz, titled “Capacity Building And Technology Development By Universities In India’s Clean Air Program”, July 14, 2022.
  34. Invited talk in Azadi ka Amrit Mahotsav, 75 lecture series, Indian Council of Agriculture Research, titled “Capacity Building and Technology Development by Technical Institutions in National Clean Air Program”, July 13, 2022
  35. Delivered the scientific talk at TROPOS, Leibniz Institute for Tropospheric Research, Germany, on “Capacity Building and Technology Development by Universities In India’s Clean Air Program”, July 11, 2022.
  36. “Hybrid Air Quality Monitoring Network”, National Air Quality Resource Framework      (NARFI), June 22, 2022, IIC, New Delhi
  37. Invited talk titled “Hyper Local Air Quality Monitoring And Source Attribution In             Cities Of Lucknow And Kanpur, Advisors and Influencers round table, June 06,       2022, IIT Kanpur
  38. Invited talked titled “Achieving clean air goal in sustainable Indian Cities”, Webinar             on Air quality management and sustainability June 03, 2022, Dayal Bagh Educational     Institute, Agra
  39. Invited talk titled “Capacity Building and Technology Development by Universities in         India’s Clean Air Program”, National workshop on “Air Pollution and Health             Impacts” (Need of      interdisciplinary  Research), June 01, 2022, Department of Environmental Sciences, Central University of Jammu
  40. Invited talk in a Consultation Workshop on ”Implementing ICCC as a Service model in cities” at India Habitat Centre (New Delhi), December 15, 2021.
  41. Keynote talk titled, “Precipitation in Himalayas: Role of Aerosols and Orography” in Workshop on Himalayan Biosphere-Atmosphere-Hydrosphere Interactions: Status, Challenges, and Way Forward Under National Mission on Himalayan Studies (NMHS), MoEFCC, GoI, G. B. Pant National Institute of Himalayan Environment (GBPNIHE), Almora, Uttarakhand, December 14, 2021.
  42. Invited talk on Sensor Based AQ Network In India, US Environment Protection Agency, October 26, 2021
  43. Invited Talk on New Technologies to Measure Air Pollution and its Sources, Air Pollution: Facts to Act, Lucknow, September 29, 2021.
  44. Plenary Talk on Sources, processing and impacts of atmospheric haze over Indo Gangetic Plains (IGP), Frontiers in Geoscience Research Conference, PRL, September 28, 2021.
  45. Invited Talk on Assessment of Low-Cost Sensor based PM2.5 and PM10 Monitoring Network in Maharashtra, Third India Air Quality Convening, September 27, 2021.
  46. Invited talk on “Formation, composition and, the evolution of Secondary Organic Aerosols (SOA) during the winter periods in Indo-Gangetic Plain, Joint Research Centre, European Commission, September 24, 2021.
  47. Low-cost sensor-based air quality monitoring networks, Capacity development programme on air quality management and emission reduction of PM 2.5 for Asian countries, Regional Resource Center for Asia and the Pacific (RRC.AP), Asian Institute of Technology, Bangkok, September 13, 2021.
  48. Advanced monitoring technologies and Capacity Building to Support India's Clean Air Program, Institute of Advanced Sustainability Studies, Potsdam, September 07, 2021.
  49. Advanced Technologies to help Clean Air Program, Tata Steal, September 07, 2021.
  50. Invited talk titled, “Capacity Building for Air Pollution Control in India” on National Knowledge Network under NCAP, Air Pollution Webinar, (January 20, 2021).
  51. Invited talk titled, “Air Pollution Monitoring and Analysis in India”, Symposium on Air Pollution Measurement and Analysis Systems (APMAS) Global Perspectives and Approach for India, Webinar organized by the Indian Institute of Technology Delhi and the World Bank (January 15-20, 2021).
  52. Invited talk titled “Capacity Building for Air Pollution Control in India”, Symposium on Air Pollution Measurement and Analysis Systems (APMAS) Global Perspectives and Approach for India, Webinar organized by the Indian Institute of Technology Delhi and the World Bank (January15-20, 2021).
  53. Invited talk titled “Particulate Matter and Gas Sensors Calibrations” in online Technical Exchange on Mainstreaming of New Air Quality Sensor Technologies, Webinar organized by Department of Environmental Health (December 16, 2020).
  54. Plenary talk “Scaling of sensor-based monitoring, real time source apportionment and capacity building under the National Clean Air Mission”, webinar on Fifth Indian International Conference On Air Quality Management (IICAQM 2020), jointly organized by Department of Civil  Engineering, IIT Madras, University of Bath (UK), Australian National University (Australia), and UFZ Helmholtz Centre for Environmental Research (Germany), (December 11, 2020).
  55. Panelist and Speaker, Webinar on  Source Apportionment and Emission Inventories studies in non-attainment cities in India, IIT Delhi (November 26, 2020).
  56. Invited talk titled “Nation Wide Sensor- based Monitoring, Real time Source Apportionment and Capacity Building under the National Clean Air Mission,  Webinar organized by Shakti Sustainable Energy Foundation (November 17, 2020).
  57. Invited talk titled “Aerosols and it’s Impacts on Climate and Crop Yield” Webinar on Agriculture and Food Technologies and Mechanisms of adaptation to Climate Change,  in collaboration with Department for International Cooperation of the Russian Academy of Sciences organized by CSIR-National Botanical Research Institute, Lucknow (November 11, 2020).
  58. Invited talk titled “Air Pollution-Land Use-Cloud Interactions: Impact on Climate Change, Agriculture, Hydrological Cycle, Human Health and Monumental Heritages” in Online Sustainability Seminar Series, a webinar hosted by KPCSD, IIT Gandhinagar (November 9, 2020).
  59. Invited talk titled “Sensor-based Streaming Analytics and Near-Real Time source Apportionment of Air Pollution” in Online International Conference on Aerosol Air Quality, Climate Change and Impact on Water Resources and Livelihoods in the Greater Himalayas, webinar hosted by ARIES Nainital (September 14, 2020).
  60. Panel discussion on “Air Pollution Data and Science” in Confederation of Indian Industry (CII) 15th Sustainability Summit (September 10, 2020).
  61. Invited talk titled, “Tracking Sources of Air Pollution in Real-Time” CERCA Webinar on the occasion of International Day of Clean Air for Blue Skies (September 7, 2020).
  62. Invited talk titled, “Unraveling Tiny Monstrous Organic Aerosols: Key to Achieve Blue Skies and Improved Human Health” in ACS Science Talks: Virtual Lecture Series (August 28, 2020).
  63. Invited talk tilted, “Importance and need for reliable and robust data for improving air quality” in India Clean Air Summit hosted by Center for Study of Science, Technology and Policy, CSTEP (August 25, 2020).
  64. Invited talk titled “Air Quality in New Delhi during the COVID-19 induced lockdown” in The Impacts of COVID-19 Lockdowns on India’s Air Quality, webinar hosted by World Bank and NCAP Knowledge Network, (July 28, 2020).
  65. Invited talk titled “Published results of Air Quality Experiment in Delhi”, meeting organized by Global Strategic Communications Council (GSCC), (July 23, 2020).
  66. Invited lecture titled “Implementation of National Clean Air Programme” in National Clean Air Program, Princeton University's first annual conference on Global India, Princeton University (USA,
    March 27, 2020).
  67. Invited talk titled, “Combination of dynamic real-time source apportionment and low-cost sensors for air pollution reduction” in Earth Science Lecture Series, IIT Gandhinagar (Ahmedabad, January
    6, 2020).
  68. Invited talk titled, “Development and adoption of low-cost sensor-based nationwide air quality monitoring networks” in Workshop Brainstorming Session on Low-cost Sensor based Real-time Air
    Quality Monitoring with advances in IoT, Machine Learning and AI, Prithvi Bhavan, India Habitat Centre (Delhi, January 2, 2020).
  69. Invited talk titled, “Air Quality Improvement through Dynamic Source Apportionment” in 4 th Indian International Conference on Air Quality Management, IIT Bombay (Mumbai, December 19, 2019).
  70. Invited talk titled, “Dynamic Source Apportionment for Air Quality Improvement” in India CEO Forum for Clean Air at India Habitat Centre (New Delhi, December 17, 2019).
  71. Invited speaker in the panel discussion on “Alignment of CSR with SDGs with sector focus on Air Pollution” in CII National CSR Summit, Hyatt Regency (New Delhi, December 12, 2019).
  72. Invited talk titled, “Role of sensor technology in policymaking”, stakeholder consultation workshop on 'Low-Cost Air Quality Monitoring Sensors in India: Applications and Way Forward' organized by Shakti Sustainable Energy Foundation at Casuarina Hall, India Habitat Centre (New Delhi, August 7, 2019).
  73. Keynote talk titled, “New initiatives to measure and understand air pollution in Northern India: Hybrid approach based on high end mass spectrometer and low cost sensors, in6th SEE event on Air Pollution organized by IIT Kanpur and the Alumni Association of IITK (IIT Kanpur, January 10, 2019).
  74. Keynote talk titled, “New initiatives to measure and understand air pollution in Northern India: Hybrid approach based on high end mass spectrometer and low cost sensors” in 3-Days International Conference on ‘Advanced Technologies for Industrial Pollution Control, (ATIPC - 2018)’ at Indian Institute of Engineering Science and Technology (IIEST), Shibpur (Kolkata, December 18, 2018).
  75. Invited talk titled, A collaborative project SATVAM to understand air quality in India and new learnings of pollution sources in Gangetic Plains” in Evening Networking Reception with Duke faculty and conference delegates at Desire hotel Le Meridien (Delhi, December 13, 2018).
  76. Invited talk titled, “Aerosol-cloud-rainfall interactions over India, in Indian Aerosol Science and Technology Association (IASTA), conference at IIT Delhi (Delhi, November 26, 2018).
  77. Invited talk titled, “Urban and aerosol-induced short to long term changes in rainfall in Indian summer monsoon region and associated implications to climate” in 63rd Sir Albert Charles Seward Memorial Lecture, Birbal Sahni Institute of Palaeosciences (Lucknow, November 14, 2018).
  78. Invited talk titled, “Current state of play of air pollution-challenges and gaps for cities of Lucknow and Kanpur” in National Workshop Scoping Study on Clean Air at Hotel Claridges (New Delhi, June 15, 2018).
  79. Invited talk titled, “Delhi air quality experiment” in Stakeholder Consultation Workshop on NCAP organized by Ministry of Environment, Forest and Climate Change alongwith CPCB, World Bank and TERI at Ganga Auditorium, Vayu Wing, Indira Paryavaran Bhawan, Jor Bagh in (Delhi, April 18, 2018).
  80. Invited talk titled, Aerosol-surface forcing-Rainfall associations over Gangetic Plains, in “National Conference on Recent Advances in Environmental Sciences, (NCRAES-2018)” at School of Environmental Science, Jawaharlal Nehru University in (Delhi, March 22, 2018).
  81. Invited talk titled, Problem, measurement and sources- The air quality conundrum in DainikJagran Clean Air Conclave at Hotel Hilton Gargen In (Lucknow, February 17, 2018).
  82. Invited talk titled, Sensor based technologies for air pollution monitoring in Technologies for management and abatement of air pollution at Ministry of Environment, Forest and Climate
    Change (Delhi, February 13, 2018).
  83. Popular Lecture titled, The state of air pollution in Indo-Gangetic Plains and possible solutions, Dayalbagh Educational Institute, (Agra, December 22, 2017).
  84. Invited talk titled, Cities Infrastructure & Sustainability cities in a training program as part of joint SRU-Clarkson-ICMR initiative to build capacities in the areas of Air Quality, Climate and Health, at the SRU-ICMR Center for Advanced Research, SRU (Chennai, December 19-20, 2017).
  85. Panelist, Washington University St Louis Forum on Energy, Environment and Agriculture at Leela Palace Hotel (New Delhi, December 15-16, 2017).
  86. Invited talk titled, Aerosol-cloud-surface-radiation-rainfall-climate interactions over Indian Monsoon region, in “5th Rajasthan Science Congress” at Amity University, (Jaipur, October 13, 2017).
  87. Invited talk titled, Aerosol-surface forcing-Rainfall associations over Gangetic Plains, in National Workshop on “Urban Climate: Science, impacts and Adaptation” at Indian Institute of Technology-Bubaneswar (Bhubaneswar, September 21-22, 2017).
  88. Invited talk titled, Aerosol impact on weather to climate scales over IG Basin: Results from observational and modeling based analysis, in International conference on Understanding, Predicting and projecting the Climate change over Asian Region (UPCAR), at S.V. University (Tirupati, June 26-28, 2017)
  89. Invited talk titled, Chemical properties of geoengineering aerosols, in National Roundtable Discussion on Geoengineering and India: Science and Policy, at Indian Institute of Technology-Delhi (New Delhi, June 23, 2017).
  90. Keynote talk titled, ‘Hygroscopicity-CCN-clouds and rainfall associations over Ganga Plains’ at Wadia Institute of Himalayan Geology (Dehradun, May 18, 2017).
  91. Lead talk titled, ‘Direct and indirect effects of aerosols on radiative forcing and rainfall over Indo-Gangetic plains in International Conference on Aerosol Climate Change Connection (AC3) at Bose
    Institute (Darjeeling, April 25, 2017).
  92. Invited talk titled, ‘Scale and adequacy of monitoring needed in Indian cities’, in Global Strategic Communications Council (GSCC) Air Quality Workshop at Juniper Hall, IHC (New Delhi, April 12, 2017).
  93. Invited talk titled, ‘Aerosol direct and indirect effects in Gangetic plains’, in Brainstorming Meeting on Climate change research in India: Progress, challenges, opportunities and way forward, BHU
    (Varanasi, February 23, 2017).
  94. Invited talk titled, ‘Aerosol-Cloud-Surface-Radiation-Rainfall interactions over Indo-Gangetic Plains (IGP)’ in Indo-Dutch International conference ‘Climate and Atmospheric Sciences & Applications’ at Indian Institute of Technology-Delhi(New Delhi, February 21, 2017).
  95. Invited talk titled ‘Aerosol pollution: Implications to health, economy and climate’, INSPIRE-2017 Programme at Amity University (Lucknow, February 15, 2017).
  96. Lead talk titled ‘Air pollution sources in India: Measurement and latest findings’ Workshop on Air Quality at Hotel Westinn (Varanasi, December 12, 2016).
  97. Invited talk titled ‘Coupling of aerosol-land-cloud-rainfall system over Gangetic Plains: Observations and modeling analysis” Indo-UK Water Center (IUKWC) workshop at IITM (Pune, November 30, 2016).
  98. Invited talk titled ‘Variability in aerosol properties, their direct and indirect effect over Gangetic Plains’ Seminar at Centre for Ecology and Hydrology, UK (Wallingford, September 17, 2016).
  99. Invited talk titled ‘Air pollution sources in India: measurements and latest findings, Air Quality in Indian Cities at Taj Hotel (Lucknow, May 25-26, 2016).
  100. Invited talk titled ‘Organic aerosols (OA) in Gangetic Basin: Composition, Chemistry, CCN, Radiative and health effects’, Workshop on biosphere-atmosphere interactions and impacts on climate and air quality and the iLEAPS SSC meeting in IISER, Mohali (Chandigarh, March 21, 2016).
  101. Invited talk titled ‘Air pollution implications to health, climate, agriculture and economy’, Surya Roundtable Meeting on Climate Credit Pilot Project at India International Centre (New Delhi, March
    15, 2016).
  102. Invited talk titled ‘Aerosol's impact on health and climate of Gangetic Plain’, INSPIRE 2016 Programme at Amity University (Gwalior, January 21, 2016).
  103. Invited talk titled ‘Smoke, Dust, and Haze: Implications to health, climate, and economy’, INAE Kanpur Chapter Seminar at Indian Institute of Technology-Kanpur (Kanpur, January 20, 2016).
  104. Invited talk titled ‘Discoloration of the TajMahal, Adverse Health effects and Climate Forcing due to Municipal Solid Waste and Dung Cake Burni’, Workshop on Developing Smart, Healthy and Sustainable Cities: Learnings from US, China and India at The Lalit Hotel (New Delhi, January 11, 2016).
  105. Invited talk titled ‘Hydro climate of gangetic system’ India-UK Workshop on Future Ganga: Science Needs for Water Security at Tal Mahel Hotel (New Delhi, December 3, 2015).
  106. Invited talk titled ‘The human-ganga biome interactions: Unravelling the influences of environmental pollutants on humans and a living river’ Workshop on Non Putreying Properties of Ganga Water at All India Institute of Medical Sciences (New Delhi, November 16, 2015).
  107. Invited talk titled ‘Dust, other ions can cause health problem’ Birbal Sahni Institute of Palaeobotany (Lucknow, August 24, 2015).
  108. Contributed talk ‘Particulate pollution and daily surface rainfall: Observational study over Indian summer monsoon region’ AGU Chapman conference on Evolution of the Asian Monsoon and its
    Impact on Landscape, Environment and Society: Using the Past as the Key to the Future, (The Chinese University of Hongkong, June 14-18, 2015).
  109. Contributed talk ‘Optical properties of brown carbon and its impact on earth's radiative budget’ Workshop for Developing Priority Themes and Activities for IGAC Monsoon Asia and Oceania Networking Group (IGAC-MANGO), Asian Institute of Technology (Bangkok, Thailand, June 11- 12, 2015).
  110. Invited participant ‘Science-Policy Dialogue’, organized by the Scientific Advisory Panel of the Climate and Clean Air Coalition (CCAC) to Reduce Short-Lived Climate Pollutants (SLCP), Headquarters of World Meteorological Organization (Geneva, May 20-21, 2015).
  111. Contributed talk titled ‘Size resolved fog water chemistry and its atmospheric implications’ European Geosciences Union (Vienna, Austria, April 12-17, 2015).
  112. Invited talk titled 'Aerosol's impacts on climate, health, agriculture and monuments', Chandigarh Science Congress, Punjab University (Chandigarh, February 25, 2015).
  113. Invited talk titled ‘Aerosol-cloud-rainfall associations over India’, International Workshop on Climate Change, Ansal University (Gurgaon, January 12, 2015).
  114. Invited talk titled ‘Atmospheric observations and laboratory studies of carbonaceous aerosols’, Indian Aerosol Science and Technology Association, Biennial Conference, (Banaras Hindu University, Varanasi, November 12, 2014).
  115. Invited talk titled ‘Brown carbon absorption and its Impact on atmospheric radiative forcing’, ABC (Atmospheric Brown Clouds) – SLCP (Short-Lived Climate Pollutants) symposium in Tokyo, (Japan, July 21-23, 2014).
  116. Theme Leader and organiser, Clean Air, Indo-German Frontiers of Engineering,Clean Potsdam, (Germany, June 23-25, 2014).
  117. Invited talk ‘1 st Workshop on Climate Science and Policy Workshop, Indian Institute of Technology-Bombay, (Mumbai, March 6-7, 2014).
  118. Invited talk ‘Scientific basis for knowledge to action’, Policy Conclave on Reducing Vehicular Emissions to Improve Air Quality at Taj Hotel, (New Delhi, February 4, 2014).
  119. Invited talk titled ‘Observations and monitoring needs’, Policy conclave on reducing vehicular emissions to improve air quality at Taj Hotel, (New Delhi, February 4, 2014).
  120. Invited Interdisciplinary Lecture titled ‘Atmospheric aerosol measurements: India perspective’, National Space Science Symposium, Dibrugarh University, (Assam, February 1, 2014).
  121. Plenary lecture on Long-term field observations and laboratory studies of atmospheric aerosols from Kanpur, Indo-Gangetic Basin, in 8th Asian Aerosol Conference, Australian Technology Park,
    Sydney, (Australia, December 3, 2013).
  122. Invited talk on 'Aerosol measurements: India perspective', India-California Air-Pollution Mitigation Program: Initiative for Mitigating Air Pollution from the Transportation Sector, Scripps Institute of
    Oceanography and The Energy and Resource Institute, Oakland, CA, (USA, October 22, 2013).
  123. Invited talk on 'Role of chemical composition on CCN activity and Evaluation of microphysics parameterizations in WRF against CAIPEEX profiles' In CAIPEX Science meeting, Indian Institute of Tropical Meteorology, (Pune, October 17, 2013).
  124. Invited talk titled ‘Long-Term field observations and laboratory studies of atmospheric aerosols from Kanpur, Indo-Gangetic Basin’, Center for Climate Change, Indian Institute of Technology-Bombay (Mumbai, October 9, 2013).
  125. Invited talk on 'Evaluation of WRF-chem simulations during an extreme rainfall event over Indo-Gangetic Plain', in Monsoon Research and Prediction, Indo French Centre for Promotion of Advance Research in coordination with MoES, (New Delhi, October 5, 2013).
  126. Invited talk in a ‘CAIPEEX-Phase III – IGP campaign meeting’ organized by Indian Institute of Tropical Meteorology, (Pune, August 30, 2013).
  127. Invited talk in a workshop “Mars Orbiter Mission” organized by Physical Research Laboratory, (Ahmedabad, July 26-27, 2013).
  128. Invited talk in a workshop ‘First Annual Regional Atmospheric Science (FARAS)’ organized by International Center for Integrated Mountain Development (ICIMOD), (Kathmandu, June 13-14, 2013).
  129. Invited lecture in Naraina Group of Institution, (Kanpur, June 11, 2013).
  130. GCR Generated Aerosol Electrification and the Effects on Cloud Microphysics in Earth and Planetary Atmospheres, Laboratoire de Physique etChimie de l'Environnement et de l'Espace,
    CNRS, Orleans, (France, July 4, 2012).
  131. Invited talk titled ‘Climate impacts of aerosol over Ganga Basin’ in a Alpine Summer School on Climate, Aerosols and the Cryosphere jointly organized by CNRS, France, ISAC-CNR, Italy and NSF, USA at Valsavarenche, Valle d'Aosta (Italy, June 27, 2012).
  132. Invited talk in a workshop organised by International Center for Integrated Mountain Development (ICIMOD), Kathmandu, (Nepal, April 2-3, 2012).
  133. Invited talk titled 'Climate impacts of aerosols' in a conference jointly organized by Department of HSS, IITK and Liberty Institute, Delhi on 'Climate Change: Science and Society', (IITK March 30-31, 2012).
  134. Invited lecture in national seminar on Interdisciplinary application of weather and climate-Computational Perspective, C-DAC, (Pune, January 25, 2012).
  135. Invited talk in US - India Workshop on Air Quality and Climate in Administrative Staff College of India, (Hyderabad, Sept. 12-14, 2011).
  136. Lead Speaker in Indo-German Frontier of Engineering, (Khandala, June 2011).
  137. Invited talk at Bhabha Atomic Research Center, (Mumbai, June 09, 2011).
  138. Invited talk, QIP Course, Indian Institute of Technology Delhi (Delhi, May 2011).
  139. Invited talk in Brain Storming Session on Technology Vision 2035, IT-BHU, (Varanasi, May 2011).
  140. Invited lecture in Brain Storming Session on Mars, Physical Research Laboratory, (Ahmedabad, March 2011).
  141. Invited Lecture, Colloquium, National Physical Laboratory, (New Delhi, March 2011).
  142. Invited talk, National Atmospheric Research Laboratory, Department of Space, (Gadanki, February 2011).
  143. Invited lecture in local chapter of Institution of Engineers, Harcourt Butler Technical University (Kanpur, 2010).
  144. Invited talk, Geophysical Fluid Dynamical Laboratory, Princeton University, (US, June 2010).
  145. Invited lecture, Planetary Exploration Program of ISRO, Physical Research Laboratory, (Ahmedabad, May 2009).
  146. Invited Colloquium, Physical Research Laboratory, (Ahmedabad, May 2009).
  147. Lead Speaker, Third Indo-US Frontier of Science (Agra, March 1-4, 2009).
  148. Invited Lecture at Aryabhatta Research Institute of Observational Sciences (ARIES), (Nainital, October 2008).
  149. Lecture at Air Force Administrative College, (Coimbatore, December 2007).
  150. Five lectures delivered at the Winter School on Modeling of Planetary Atmospheres organised by Physical Research Laboratory, (Ahmedabad, January 2007).
  151. Invited seminar at Center for Climate System Modeling, The University of Tokyo, (Japan, July 2006).
  152. Invited talk in Department of Chemical Engineering, Institute of Technology, (Banaras Hindu University, Varanasi, February 2006).
  153. Invited talk in workshop on Nanoparticle Aerosol Science and Technology (NAST): Emerging Trends and Priorities (IIT Mumbai, December 2005).
  154. Invited lecture at Center for Atmospheric and Oceanic Sciences, IISc, (Bangalore, September 2005).
  155. Five invited lectures in the 4th PG course on Space and Atmospheric Science of CSSTEAP (Center for Space and Technology Education in Asia and Pacific), (Physical Research Laboratory, Ahmedabad, July 2005).
  156. Invited seminar given at Aeronomy Laboratory National Oceanographic and Atmospheric Administration, (Boulder, US, June 2004).
  157. Academic Staff College, Banaras Hindu University(Varanasi, March 2004).
  158. Invited lecture in local chapter of Institution of Engineers, Harcourt Butler Technical University (Kanpur, January 2004).
Sarangi, C.,S.N. Tripathi and Shivam Tripathi, Evaluating cloud microphysics against aircraft measurements over India: A CRM study using WRF-CHEM, AGU Fall Meeting, San Francisco, USA, December 09-13, 2013.
pdf
Bhattu, D. and S.N. Tripathi, Closure between measured and predicted cloud condensation nuclei concentration at Kanpur, Indo-Ganetic Basin, AGU Fall Meeting, San Francisco, USA, December 09-13, 2013.
pdf
Misra, A., Kundan Kumar, M. Michael and S.N. Tripathi, Aerosol radiative forcing over north India during pre-monsoon season using WRF-CHEM, AGU Fall Meeting, San Francisco, USA, December 09-13, 2013pdf
Bhattu, D. and S.N. Tripathi, Effect of organics and their hygroscopicity on cloud condensation nuclei (CCN) activity, European Aerosol Conference, Prague, Czech Republic, September 1-6, 2013.pdf
Kaul, D.S., S.N. Tripathi and Tarun Gupta, Chemical and microphysical properties of aerosol during Foggy and Nonfoggy episodes over a typical location in Indo-Gangetic Plain, EGU General Assembly, Vienna, Austria, April 22-27, 2012pdf
Misra, A.,S.N. Tripathi, D.S. Kaul and Ellsworth J. Welton, Comparison of CALIOP level 2, version 3 backscatter and extinction products with MPLNET data at Kanpur, India, EGU General Assembly, Vienna, Austria, April 22-27,
pdf
Kaul, D.S., S.N. Tripathi, Tarun Gupta, V. Tare, Enhanced secondary organic aerosol during fog episodes over a typical location in Indo-Gangetic Plain, AGU Fall Meeting, San Francisco, USA, December 04-09, 2011.
pdf
Kaul, D.S., S.N. Tripathi, Tarun Gupta, V. Tare, Enhanced secondary organic aerosol during Foggy episodes, European Aerosol Conference, Manchester, UK, September 4-9, 2011.
pdf
Jaidevi, J., Priya Choudhry, Marykutty Michael, S.N. Tripathi and Tarun Gupta, First direct evidence of strong absorption associated with coarse mode particles over CTCZ region from Aircraft experiment 2009, European Aerosol Conference, Manchester, UK, September 4-9, 2011.
pdf
S.N. Tripathi., Sagnik Dey, J. Jaidevi, B.N. Singh, Marykutty Michael and Tarun Gupta, Thick Absorbing Aerosol Layer Observed in the Monsoon Season over India, AGU Fall Meeting, San Francisco, USA, December 13-17, 2010.
pdf
Jaidevi, J., S.N. Tripathi, Tarun Gupta, B.N Singh and V.Gopalakrishnan, Aerosol radiative impacts over Indian CTCZ region: Results from Pilot 2008 Aircraft experiment, IASTA, Darjeeling, March 24-26, 2010.
pdf
Mishra, S.K. and S.N. Tripathi, Optical properties of mineral dust over the global deserts, International Radiation Symposium, Brazil, August 3-8, 2008.
pdf
Ismail, M.R.T., R.G. Grainger and S.N. Tripathi, Quantifying global contrail-cirrus, Non-CO2 Aviation Effects Conference arranged by OMEGA, Lady Margaret Hall, Oxford July, 2008.
pdf
Michael, M. and S.N. Tripathi, Aerosol charging by ion and electron attachment in the lower atmosphere of Mars, National Space Science Symposium, Ooty, February, 2008.
pdf
Mishra, S.K. and S.N. Tripathi, Modeling optical properties of mineral dust over Indian desert, ACCLINT, Ahemdabad, November 2007.
pdf
Vanga, A., S.N. Tripathi and A. Ghosh, Role of in-situ formed new particles in ice nucleation in cirrus clouds, ACCLINT, Ahmedabad, November 2007.
pdf
Pratap, V., V. Bharat, N. Tripathi, S.N. Tripathi, T. Gupta, A. Mishra and U. Das, An experimental investigation of the effects of environmental and fog condensation nuclei parameters, IASTA, New Delhi, November, 2007.
pdf
Tahir, M.R., R.G. Grainger and S.N. Tripathi, Producing global maps of aircraft-induced cirrus via microphysical modeling, QUANTIFY Annual Meeting, Mainz, Germany, 27 February 27- March 3, 2007.
pdf
Nakajima, T.Y., S.K. Mishra, S.N. Tripathi and T. Nakajima, Tracing optical-parameters of cirrus clouds containing hexagonal ice-crystals using surface integral equation Method of muller type,  SPIE Conference, Goa, November 2006.
pdf
Kanawade Vijay, Sanjeev Kumar and S.N. Tripathi, Model studies on atmospheric ion-induced nucleation of sulfuric acid and water: Interpretation of in-situ measurements, First European Space Weather Week, ESTEC, Noordwijk, (The Netherlands), November 29- December 3, 2004.
ppt

Gallery

Links

Oped

  1. Fixing Mumbai's air a prescription, Nov 4, 2023, uploads/2023/11/Fixing-Mumbais-air-a-prescription.jpeg
  2. Prof. Tripathi featured on Al Jazeera’s report focusing the topic “Scientists decipher the cause of New Delhi’s haze, Mar 18, 2023.
    https://www.youtube.com/watch?v=3_rZOLUDCT8&embeds_referring_euri=https%
  3. Tripathi, S.N., “Need for Long-term measures”, December 14, 2022, Dainik Jagran., uploads/2022/12/dj-delhi.png
  4. Tripathi, S.N. “Strengthen Pollution Regulator, get more staff, train them in tech and backup with stringent norms” says expert, November 7, 2022, The Indian Express, Idea Exchange.
    uploads/2022/11/Delhi-November-07-2022-page-15- 2.pdf
  5. Tripathi, S.N., Why tackling air pollution is a win, win, The Hindu, January 12, 2022, https://www.thehindubusinessline.com/opinion/why-tackling-air-pollution-is-a-win- win/article38239774.ece/
  6. Tripathi, S.N., An Expert Explains: WHO’s stark message on air quality – and what India must do, The Indian Express, October 7, 2021, https://indianexpress.com/article/explained/explained-whos-stark-message-on-air- quality-and-what-india-must-do-7556737
  7. Tripathi, S.N. and Vipul Arora, measuring indoor air pollution: Why low-cost technology is critical, Hindustan Times, June 17, 2021,
    https://www.hindustantimes.com/opinion/measuring-indoor-airpollution-why-low- cost- technology-is-critical-101623911895014.html
  8. Tripathi, S.N., Rediscovering sustainable development through a covid-19 lockdown lens, Opinion, The Indian Express, May 8, 2020,
    https://indianexpress.com/article/opinion/web-edits/rediscoveringsustainable- development-through-a-covid-19-lockdown- lens-6399986
  9. Tripathi, S.N., Witnessing the future through the corona virus lockdown, Science & Technology, Energy & Environment, The Hindu, April 25, 2020
    https://www.thehindu.com/sci-tech/energy-and-environment/witnessing-the-future- through-the-lockdown/article31432865.ece
  10. Tripathi, S.N., Air pollution: Reduced self-cleansing capacity of atmosphere, Business Standard & Financial Express, Dec 1, 2017
    https://www.business-standard.com/article/news-ians/air-pollution-reduced-self- cleansing-capacity-of-atmosphere-comment-special-to-ians-117120100271_1.html
  11. Tripathi, S.N., Pollution: particulate matter in India higher than WHO limit, article published in The Hindu, May 7, 2015,
    https://www.thehindu.com/sci-tech/Pollution-particulate-matter-in-India-higher-than- WHO-limit/article60167057.ece

Sensor based AQ Monitoring


Role of sensors in air quality (AQ) monitoring

Measurements of air pollution underpin a wide range of applications that extend from academic investigation to regulatory functions and services for the general public, governments, and businesses. A nationwide dataset on air pollution is required to raise awareness of pollution and for advancing research in associated fields. Also, public and media attention is increasingly conscious of the health and economic expenses of high outdoor PM pollution. Existing regulatory techniques for assessing urban air quality (AQ) rely on a small network of continuous ambient air quality monitoring stations (CAAQMSs) that are instrumented with expensive air quality monitoring gas analyzers and beta-attenuation monitors and provide highly accurate measurements (Sahu, Tripathi et al., 2021). However, these networks are established at a commensurately high setup cost and are cumbersome to maintain (Sahu, Tripathi et al., 2020), making rapid increase of dense CAAQMS networks impractical. Consequently, the AQ data offered by these sparse networks, however accurate, limit the ability to formulate effective AQ strategies. The “affordable” or “low-cost” sensor devices is a promising technology for increasing the density of the sparse urban PM pollution monitoring network. In developing countries like India, the implementation of such technology becomes a very relevant solution for large-scale deployment of a nationwide AQ monitoring network.

Streaming Analytics over Temporal Variables from Air quality Monitoring (SATVAM) initiative

SATVAM initiative has been developing low-cost air quality (LCAQ) sensor networks based on highly portable internet of thing (IoT) software platforms. The project aims to fundamentally redefine how AQ monitoring is done in India. At the time when the project started in 2017, India had under 200 continuous air quality monitoring stations across the country. All of the equipment used by the regulatory agencies that time was imported from the USA or Europe with the regulatory grade PM2.5 and PM10 BAM monitors costing upwards of $15,000 per BAM and for all the notified gas pollutants analyzers at US $200,000 per monitoring site. There was a recognised need for continuous AQ monitoring in the 7000+ census cities and towns of India. The SATVAM team had embarked on building India’s first scientifically validated and calibrated air quality monitoring network for pollutants PM2.5, PM10, NOx and Ozone by rigorously evaluating LCAQ sensor devices and networks in harsh resource constrained environments.
A large-scale deployment of the SATVAM network has been well-underway around for the past at the IIT Kanpur campus. Researchers and active citizens had access to the continuous hourly data for making better health-related decisions as well as understanding the long-term AQ trends in different locations of the campus.
Based on all of the work done in the SATVAM project, the Maharashtra Pollution Control Board (MPCB) commissioned a project to IIT Kanpur for rigorous field validation of PM2.5 and PM10 based monitors built by 4 leading start-ups of India. The results of the field evaluation at 15 different locations of Mumbai have been extremely promising and have encouraged the Maharashtra regulator to consider deploying this sensor technology in thousands of locations in Maharashtra. The Chairman of MPCB has been in touch with the PI of SATVAM, Prof. S.N. Tripathi, to understand the use of "mobile vans" equipped with reference monitors for dynamic field calibration of the sensor devices on a year-round basis across the city. On 20 May 2021, the Ministry of Environment Forests & Climate Change (MoEFCC) reconstituted the Steering Committee for implementation of the National Clean Air Programme (NCAP). The PI of SATVAM has been nominated as an expert committee member of this flagship programme of the central government for clean air in India.  Based on the scientific papers and the results from the SATVAM project shown to the committee, there is now a broad consensus within the NCAP policy makers to implement this sensor-based technology in few more cities of India.
Along with this, The National Health Systems Resource Centre (NHSRC), being part of the Ministry of Health and Family Welfare (MoHFW) has commissioned IIT Kanpur, led by the PI of SATVAM and the industry partner Respirer Living Sciences, to deploy a variant of the SATVAM monitors to evaluate the health effects from the changing AQ for the beneficiaries of the Pradhan Mantri Ujjwala Yojana (PMUY). Nearly a 100 AQ monitors have been deployed in 6 states of India, covering 12 districts each with varying levels of PMUY beneficiaries, from amongst the highest PMUY beneficiaries to the lowest density (https://www.youtube.com/watch?v=X2EktGr_69s)

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   Field deployed low-cost air quality (LCAQ) monitoring SATVAM sensor

Key highlights from published papers of IIT Kanpur’s research group

Researchers at IIT Kanpur, India, in collaboration with national and international institutes have conducted research works aimed towards establishing India's first scientifically validated and calibrated AQ monitoring network for pollutants PM2.5, PM10, NOx, and O3 by comprehensively analysing low-cost sensor networks under diverse climatic circumstances. PM2.5 sensor data has been found to be within 10% of ambient values, as measured by E-BAM, with appropriate RH corrections and linear/quadratic fit calibration (Zheng, Tripathi et al., 2018). Particulate Matter (PM2.5 and PM10) sensor data performance has been rigorously evaluated in the field in both low- and high-concentration environments. For O3 and NO2 calibration that were based on k-nearest neighbour distance metric learning, R2 were as high as 0.92 and 0.82, respectively, and exhibited a 4–20% improvement over the traditional non-parametric techniques NO2 (Sahu, Tripathi et al., 2021). PM10 levels using un-calibrated sensors co-located with research-grade equipment also showed a good correlation (R2 as high as 0.84) in Delhi (Sahu, Tripathi et al., 2020). A novel approach based on Gaussian process regression with on fly sensor calibration was also developed for the calibration of PM2.5 sensors in Delhi. Over 22 reference nodes, the method used a leave-one-out cross-validation procedure, which resulted in an overall predicted error of 30% (RMSE 33 μg.m-3) on a 24-h scale. Dynamic field calibration and surveillance of the city-level air quality network have been done using machine learning techniques such as Gaussian process regression (Zheng, Tripathi et al., 2019). In another work for PM2.5 sensors calibration, a domain adaptation-based method that can reduce the need for co-located data is proposed and the R2 is observed as high as 0.88. The use of very low-powered wireless network solutions using peer-to-peer 6LoWPAN technology (Simmhan, Tripathi et al., 2019) and energy harvesting powered IoT systems (Sharma et al., 2020) have been deployed in the real-world in India for the first time. A calibration approach based on Model-Agnostic-Meta-Learning (MAML) showed the RMSE as low as 10.3 μg.m-3 in PM2.5 measurements (Yadav, Tripathi et al., 2021).

Multicity deployments related information

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• YELLOW CIRCLE: sensor networks already deployed
• BLUE CIRCLE: will be deployed soon

Low-cost air quality (LCAQ) sensor network deployment for PM2.5 air quality monitoring at Jaipur

In collaboration with Rajasthan Pollution Control Board (RSPCB) and Ericsson, the Indian Institute of Technology (IIT) Kanpur is running the city-scale AQ monitoring project. IIT Kanpur has a Memorandum of Understanding (MoU) with RSPCB and Ericsson India is funding the research. This LCAQ monitoring sensor-based project is led by Prof. Sachchida Nand Tripathi, Department of Civil Engineering, IIT Kanpur. RSPCB has helped IIT Kanpur in deploying the LCAQ sensors at 40 important locations of Jaipur which are identified as the hotspots for air pollution. These LCAQs will continuously monitor PM2.5, PM10, and air quality index (AQI) concentrations measured in the area, providing useful and vital information on air pollution levels. It will aid in raising public awareness about air pollution among Jaipur residents. IIT Kanpur has also introduced a mobile app “Airveda” during the inaugural day of making LCAQ network data available into open domain, as part of a collaborative effort, via which pollution data may be accessed online. Interactive plots on temporal data of PM2.5, PM10, and AQI levels for these 40 identified locations, comparative studies between days, months, even seasons, and from site-to-site, as well as a map depicting the data of the relevant sites, are among the features of the mobile app. It will help us to understand the generated data on PM and AQI in a more meaningful way. Deployment sites for these LCAQ sensors include High Court Circle Jaipur, Panchyawala, Paldi Meena, Adarsh Nagar, Jamdoli, Adinath Nagar, Kanota, Police Commissionerate Campus, RSPCB Head Office Jhalana Dungari, Regional ffice North RSPCB,  Near VKIA Police Station, Near Jawahar Circle Regional Office South RSPCB,  Niwaru, Vidyadhar Nagar, Badi Chaupar, Benar Road, VKIA area, Mansarovar, Bhakrota, Bikaner Agra Marg, Gurjar ki Thadi, Near Chirayu Hospital, Chandpole, Vaishali Nagar, Kukas, Sanjay Nagar, Collectorate campus Jaipur, Yadgar, near Brahmapuri Thana, RIICO office VKIA, Sitapura Industrial Area, Airport Sanganer, Thadi Market, Secretariat campus Jaipur, Madhyam Marg-Mansarovar Jaipur, Ashind Nagar-Sanganer Road, near Chomupulia, Raghunathpur, Shastri Nagar, Sirsi Road Jaipur, and MNIT JNU Marg Jaipur.

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Low-cost air quality (LCAQ) sensor deployment for PM2.5 air quality monitoring at Lucknow and Kanpur

Lucknow is the capital of the state of Uttar Pradesh (UP) in India which frequently ranks within the list of world’s most polluted cities. The IIT Kanpur in collaboration with Uttar Pradesh Pollution Control Board, Government of Uttar Pradesh is working on a joint Indo- US project aimed at monitoring and improving the AQ in Lucknow. The main objective of the study is to develop and implement plan to reduce PM2.5 concentrationusing a combination of data gathered using satellite image-enhanced PM2.5 sensor network, integrated with meteorological modeling and source apportionment. In the process, a fleet of 71 LCAQ sensors (make: TSI, Model: 8143 BlueSky) are deployed throughout Lucknow for real-time AQ monitoring to provide high-resolution spatio-temporal PM2.5 data. The sites for the placement of these monitors were selected on the basis of their land use pattern and area representativeness characterized by inclusiveness of different sources. These included industrial regions, commercial and city centres, residential areas, rural sites, roadside areas, etc. Three of these monitors were also collocated with the UPPCB monitored regulatory instruments – CAAQMS. Prior to deployment, these sensors were tested for performance with the gold standard instrument at one-hour time integration. The linear regression model was performed which achieved a marked improvement from pre calibration (Mean Absolute Percentage Error, MAPE = 81.96 % to 37.24%) to post calibration correlation (MAPE = 16.67% to 12.73%) thereby validating their suitability for deployment. The on-field sensor comparison with CAAQMS showed promising results with R2 between 0.68 to 0.82. A transfer learning model (RF-CNN) was used for PM2.5 prediction using the microsatellite images integrated with CAAQMS data. The model predicted PM2.5 values with high spearman correlation r ~ 0.88 and RMSE ~ 37.69 for the test data. The two major on field requirements for hosting these monitors included continuous power supply (5W, 240 V) and Wi-Fi connectivity. The hosts in Lucknow are different research organizations, government offices, schools, hospitals, and universities and colleges. The data obtained is being studied for descriptive analysis on spatial and temporal scale and to identify the hotspots for air pollution.
The AQ monitoring is also conducted across Kanpur city by deploying PM2.5 sensors at NSI Kalyanpur (CAAQMS site), Kanpur Zoo, Nehru Nagar (CAAQMS site), Panki, Fazal Ganj, Jareeb Chowki, Ramadevi Chowraha and FTI, Kidwai Nadar (CAAQMS site). Following to it, gas sensors deployment will also be deployed next to each PM2.5 sensor and to MahindraTech LCAQs which are deployed under smart city scheme.

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Sensor deployment and data collection in Mumbai

Mumbai, the capital of Maharashtra, is India’s second-most populous metropolis, after Delhi, and the world’s seventh-most populous city, with a population of around 20 million people.
The LCAQ devices are deployed in Mumbai Metropolitan Region (MMR) Maharashtra, India. Following sites has been selected for the collocation of the LCAQ devices and CAAQMS: Airport, Sion, Nerul, Vile Parle, Mahape, Vasai, Borivali, Kalyan, Powai, Colaba, Mulund, Bandra, Kandivali, Worli, and Kurla. Four start-ups are selected for the deployment of the LCAQ devices named as start-up A, B, C and D (Table 1). LCAQ of start-ups A and D were deployed at all the 15 identified sites whilestartups B and C deployed their LCAQ sensors at 5 sites; namely: Airport, Sion, Nerul, Vile Parle, and Mahape.
The LCAQ sensors deployment and data collection started from November 1st, 2020 and continued till May 31st, 2021. The details of the PM, RH, and temperature sensors are listed in the Table 1. The data is available at an interval of 15 minutes, 30 minutes, and 60 minutes for CAAQMS, and 1 minute, 15 minutes, 30 minutes, and 60 minutes for start-up A. For start-up B, the data is available at an interval of 1 minute. For start-up C, the data is available at an interval of 15 minutes, and 1 hour. And for startup D, the data is available at an interval of 1 minute, 30 minutes, and 60 minutes.

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Table 1: Details of the air quality (AQ) monitoring sensors used by start-ups.

Low-cost air quality (LCAQ) sensor deployment for PM2.5 air quality monitoring at Chennai city and Kanyakumari district

Deployment locations for 40 LCAQ sensors in Chennai city are:
Nelson Manickam road, Choolaimedu bus stop, Anna University, Koyambedu Market, Vanagaram Industrial area, Alwar Thirunagar Valasaravakkam, Velacherry, Pammal, Thiruverkadu, Railway quarters Egmore, Ambattur Residential, Ashok Nagar, Selavoyal, Mathur, Manali village, PWD office Taramani, Sowcarpet, Thiruvottriyur, Kodungaiyur, CSI Ewart School, Ambattur Industrial estate, Perungudi BAM, Kodungaiyur BAM, South Thirumalai Nagar, Konnur, Koyambedu BAM, Porur Residential, Tylors Road BSNL Quarters, Ice house, Thiru. Vi. Ka. Nagar, Velachery K S Hospital, Madhavaram milk colony, Kodambakkam Residential, Solinganallur Marsh Land, Saligram, Chrome pet Traffic and Industrial Area, Palavakkam Residential, Ambattur near TI Cycle Company, Manali CPCB, Pallikaranai Marsh land, Kattupakkam Traffic area and Nanmangalam Traffic area.
Deployment locations for 4 LCAQ sensors in Kanyakumari district are:
Perumal Nagar, Karungal, Ottayalkudi and Loyala Institute of Techonology and Science, Thovalai.

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