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- W3204803970 abstract "The COVID-19 pandemic has affected severely the economic structure and health care system, among others, of India and the rest of the world. The magnitude of its aftermath is exceptionally devastating in India, with the first case reported in January 2020, and the number has risen to ~31.3 million as of July 23, 2021. India imposed a complete lockdown on March 25, which severely impacted migrant population, industrial sector, tourism industry, and overall economic growth. Herein, the impacts of lockdown and unlock phases on ambient atmospheric air quality variables have been assessed across 16 major cities of India covering the north-to-south stretch of the country. In general, all assessed air pollutants showed a substantial decrease in AQI values during the lockdown compared with the reference period (2017–2019) for almost all the reported cities across India. On an average, about 30–50% reduction in AQI has been observed for PM 2.5 , PM 10 , and CO, and maximum reduction of 40–60% of NO 2 has been observed herein, while the data was average for northern, western, and southern India. SO 2 and O 3 showed an increase over a few cities as well as a decrease over the other cities. Maximum reduction (49%) in PM 2.5 was observed over north India during the lockdown period. Furthermore, the changes in pollution levels showed a significant reduction in the first three phases of lockdown and a steady increase during subsequent phase of lockdown and unlock period. Our results show the substantial effect of lockdown on reduction in atmospheric loading of key anthropogenic pollutants due to less-to-no impact from industrial activities and vehicular emissions, and relatively clean transport of air masses from the upwind region. These results indicate that by adopting cleaner fuel technology and avoiding poor combustion activities across the urban agglomerations in India could bring down ambient levels of air pollution at least by 30%." @default.
- W3204803970 created "2021-10-11" @default.
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- W3204803970 date "2021-09-29" @default.
- W3204803970 modified "2023-10-07" @default.
- W3204803970 title "Effect of Lockdown Amid COVID-19 on Ambient Air Quality in 16 Indian Cities" @default.
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- W3204803970 doi "https://doi.org/10.3389/frsc.2021.705051" @default.
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