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dc.contributor.authorBiswal, Akash
dc.contributor.authorSingh, Vikas
dc.contributor.authorSingh, Shweta
dc.contributor.authorSokhi, Ranjeet
dc.contributor.authorKesarkar, Amit P.
dc.contributor.authorRavindra, Khaiwal
dc.contributor.authorChipperfield, Martyn P.
dc.contributor.authorDhomse, Sandip S.
dc.contributor.authorPope, Richard J.
dc.contributor.authorSingh, Tanbir
dc.contributor.authorMor, Suman
dc.date.accessioned2021-06-14T15:45:02Z
dc.date.available2021-06-14T15:45:02Z
dc.date.issued2021-04-01
dc.identifier.citationBiswal , A , Singh , V , Singh , S , Sokhi , R , Kesarkar , A P , Ravindra , K , Chipperfield , M P , Dhomse , S S , Pope , R J , Singh , T & Mor , S 2021 , ' COVID-19 lockdown induced changes in NO2 levels across India observed by multi-satellite and surface observations ' , Environmental Pollution , vol. 21 , no. 6 , pp. 5235-5251 . https://doi.org/10.5194/acp-21-5235-2021
dc.identifier.issn0269-7491
dc.identifier.otherPURE: 24823660
dc.identifier.otherPURE UUID: 52de562c-1ec7-47fa-b0e7-622d5a90bf22
dc.identifier.otherScopus: 85103589125
dc.identifier.urihttp://hdl.handle.net/2299/24582
dc.description© Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
dc.description.abstractWe have estimated the spatial changes in NO 2levels over different regions of India during the COVID-19 lockdown (25 March-3 May 2020) using the satellite-based tropospheric column NO 2observed by the Ozone Monitoring Instrument (OMI) and the Tropospheric Monitoring Instrument (TROPOMI), as well as surface NO 2concentrations obtained from the Central Pollution Control Board (CPCB) monitoring network. A substantial reduction in NO 2levels was observed across India during the lockdown compared to the same period during previous business-as-usual years, except for some regions that were influenced by anomalous fires in 2020. The reduction (negative change) over the urban agglomerations was substantial (~20 %-40 %) and directly proportional to the urban size and population density. Rural regions across India also experienced lower NO 2values by ~15 %-25 %. Localised enhancements in NO 2associated with isolated emission increase scattered across India were also detected. Observed percentage changes in satellite and surface observations were consistent across most regions and cities, but the surface observations were subject to larger variability depending on their proximity to the local emission sources. Observations also indicate NO 2enhancements of up to~25%during the lockdown associated with fire emissions over the north-east of India and some parts of the central regions. In addition, the cities located near the large fire emission sources show much smaller NO 2reduction than other urban areas as the decrease at the surface was masked by enhancement in NO 2due to the transport of the fire emissions.en
dc.format.extent17
dc.language.isoeng
dc.relation.ispartofEnvironmental Pollution
dc.subjectOMI
dc.subjectTROPOMI
dc.subjectAir Quality
dc.subjectcovid-19
dc.subjectAtmospheric Science
dc.titleCOVID-19 lockdown induced changes in NO2 levels across India observed by multi-satellite and surface observationsen
dc.contributor.institutionCentre for Climate Change Research
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionAtmospheric Dynamics & Air Quality
dc.contributor.institutionCentre for Atmospheric and Climate Physics Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85103589125&partnerID=8YFLogxK
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.5194/acp-21-5235-2021
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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