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Spatial and temporal variations of air pollution over 41 cities of India during the COVID-19 lockdown period.
Vadrevu, Krishna Prasad; Eaturu, Aditya; Biswas, Sumalika; Lasko, Kristofer; Sahu, Saroj; Garg, J K; Justice, Chris.
  • Vadrevu KP; NASA Marshall Space Flight Center, Huntsville, AL, 35811, USA. krishna.p.vadrevu@nasa.gov.
  • Eaturu A; University of Alabama in Huntsville, Huntsville, AL, USA.
  • Biswas S; Smithsonian Conservation Biology Institute, Front Royal, VA, USA.
  • Lasko K; US Army Corps of Engineers, Alexandria, VA, USA.
  • Sahu S; Utkal University, Bhubaneswar, Odisha, India.
  • Garg JK; Tata Energy Research Institute (TERI) School of Advanced Studies, New Delhi, India.
  • Justice C; University of Maryland, College Park, MD, USA.
Sci Rep ; 10(1): 16574, 2020 10 06.
Article in English | MEDLINE | ID: covidwho-834902
ABSTRACT
In this study, we characterize the impacts of COVID-19 on air pollution using NO2 and Aerosol Optical Depth (AOD) from TROPOMI and MODIS satellite datasets for 41 cities in India. Specifically, our results suggested a 13% NO2 reduction during the lockdown (March 25-May 3rd, 2020) compared to the pre-lockdown (January 1st-March 24th, 2020) period. Also, a 19% reduction in NO2 was observed during the 2020-lockdown as compared to the same period during 2019. The top cities where NO2 reduction occurred were New Delhi (61.74%), Delhi (60.37%), Bangalore (48.25%), Ahmedabad (46.20%), Nagpur (46.13%), Gandhinagar (45.64) and Mumbai (43.08%) with less reduction in coastal cities. The temporal analysis revealed a progressive decrease in NO2 for all seven cities during the 2020 lockdown period. Results also suggested spatial differences, i.e., as the distance from the city center increased, the NO2 levels decreased exponentially. In contrast, to the decreased NO2 observed for most of the cities, we observed an increase in NO2 for cities in Northeast India during the 2020 lockdown period and attribute it to vegetation fires. The NO2 temporal patterns matched the AOD signal; however, the correlations were poor. Overall, our results highlight COVID-19 impacts on NO2, and the results can inform pollution mitigation efforts across different cities of India.

Full text: Available Collection: International databases Database: MEDLINE Language: English Journal: Sci Rep Year: 2020 Document Type: Article Affiliation country: S41598-020-72271-5

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Full text: Available Collection: International databases Database: MEDLINE Language: English Journal: Sci Rep Year: 2020 Document Type: Article Affiliation country: S41598-020-72271-5