Articles | Volume 21, issue 6
Atmos. Chem. Phys., 21, 5235–5251, 2021
https://doi.org/10.5194/acp-21-5235-2021
Atmos. Chem. Phys., 21, 5235–5251, 2021
https://doi.org/10.5194/acp-21-5235-2021

Research article 01 Apr 2021

Research article | 01 Apr 2021

COVID-19 lockdown-induced changes in NO2 levels across India observed by multi-satellite and surface observations

Akash Biswal et al.

Data sets

OMI/Aura NO2 Cloud-Screened Total and Tropospheric Column L3 Global Gridded 0.25 degree x 0.25 degree V3 (OMNO2d) GESDISC (NASA Goddard Earth Sciences Data and Information Services Center) https://disc.gsfc.nasa.gov/datasets/OMNO2d_003/summary

Tropospheric NO2 from satellites, TROPOMI (S5-p) TEMIS (Tropospheric Emission Monitoring Internet Service) http://www.temis.nl/airpollution/no2.php

Central Pollution Control Board, Central Control Room for Air Quality Management – All India, Surface measured NO2 data CPCB https://app.cpcbccr.com/ccr/

VIIRS fire count data FIRMS (NASA Fire Information for Resource Management System) https://firms.modaps.eosdis.nasa.gov/

India 100m Population, Version 2 (https://www.worldpop.org/) WorldPop. https://doi.org/10.5258/SOTON/WP00532

Indian Geo-Platform of Indian Space Research Organisation Bhuvan https://bhuvan.nrsc.gov.in

Climate Data Store, ERA5 meteorology CDC https://cds.climate.copernicus.eu/cdsapp

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Short summary
Satellite and surface observations show a reduction in NO2 levels over India during the lockdown compared to business-as-usual years. A substantial reduction, proportional to the population, was observed over the urban areas. The changes in NO2 levels at the surface during the lockdown appear to be present in the satellite observations. However, TROPOMI showed a better correlation with surface NO2 and was more sensitive to the changes than OMI because of the finer resolution.
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