Articles | Volume 21, issue 17
Atmos. Chem. Phys., 21, 13311–13332, 2021
https://doi.org/10.5194/acp-21-13311-2021
Atmos. Chem. Phys., 21, 13311–13332, 2021
https://doi.org/10.5194/acp-21-13311-2021
Research article
08 Sep 2021
Research article | 08 Sep 2021

A satellite-data-driven framework to rapidly quantify air-basin-scale NOx emissions and its application to the Po Valley during the COVID-19 pandemic

Kang Sun et al.

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We bridge the gap between satellite column observations and emissions by accounting for the dynamic lifetime of pollutants due to wind dispersion and the chemical lifetime due to chemical reactions. Applying it to the Po Valley air basin, we derive the monthly emissions of nitrogen oxides using satellite nitrogen dioxide observations. We further quantify the COVID-19-driven decline of emissions and estimate a 22 % decrease in nitrogen oxide emissions due to the pandemic in 2020.
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