Environmental pollution

Response of major air pollutants to COVID-19 lockdowns in China
That provides a precious window to study how the air quality response to quick decline of anthropogenic emissions in terms of national scale, which would be critical basis to make atmospheric governance policies in the future.
Zhipeng Pei, Ge Han, Xin Ma, Hang Su, Wei Gong
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Response of major air pollutants to COVID-19 lockdowns in China