Meteorology-normalized variations of air quality during the COVID-19 lockdown in three Chinese megacities.

Atmos Pollut Res · 2022 · PMC9106379 · PMID 35601668

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an increasing trendno p-value reported

In contrast to changes in NO 2 , observed O 3 follows an increasing trend during the lockdown at all stations ( Fig. 4 and S2 ).

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