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Impacts of COVID-19 control measures on tropospheric NO$_2$ over China, South Korea and Italy

Impacts of COVID-19 control measures on tropospheric NO$_2$ over China, South Korea and Italy

Tropospheric nitrogen dioxide (NO$_2$) concentrations are strongly affected by anthropogenic activities. Using space-based measurements of tropospheric NO$_2$, here we investigate the responses of tropospheric NO$_2$ to the 2019 novel coronavirus (COVID-19) over China, South Korea, and Italy. We find noticeable reductions of tropospheric NO$_2$ columns due to the COVID-19 controls …