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- W3205433900 abstract "The COVID-19 pandemic resulted in changed emission regimes all over the world. India also imposed complete lockdown on all modes of travel and industrial activities for about 2 months from 25-March-2020 and later unlocked these activities in a phased manner. Here, we study signatures of emissions changes on levels of atmospheric trace gases and aerosols contributing to air pollution over multiple sites in India’s capital Delhi covering various lockdown and unlock phases using satellite data and in-situ observations. The resulting changes in the levels of these species were compared with respect to their average of 2015–2019 to attribute for year to year and seasonal changes. A clear impact of lockdown was observed for AOD, PM, NO 2 , CO, and SO 2 as a result of emission changes, while changed precursor levels led to a change in O 3 chemical regimes impacting its concentrations. A detailed analysis of FLEXPART trajectories revealed increased PM levels over Delhi in north-westerly air masses sourced to Punjab region all the way up to Pakistan. Changes in aerosols and NO 2 were not only restricted to the surface but transcended the total tropospheric column. The maximum decrease in PM, NO 2 , CO, and SO 2 was observed during the month of total lockdown in April. The lockdown impact varied with species e.g., PM 10 and PM 2.5 as well as locations even within the periphery of Delhi. While surface level aerosols and NO 2 showed significant and almost similar changes, AOD showed much lower decrease than tropospheric column NO 2 ." @default.
- W3205433900 created "2021-10-25" @default.
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- W3205433900 date "2021-10-13" @default.
- W3205433900 modified "2023-10-03" @default.
- W3205433900 title "Effect of Lockdown on Pollutant Levels in the Delhi Megacity: Role of Local Emission Sources and Chemical Lifetimes" @default.
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- W3205433900 doi "https://doi.org/10.3389/fenvs.2021.743894" @default.
- W3205433900 hasPublicationYear "2021" @default.
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