Comparison of air pollutants and their health effects in two developed regions in China during the COVID-19 pandemic.

J Environ Manage · 2021 · PMC7927583 · PMID 33711659

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a negative trendno p-value reported

On the other side, only 20.9% of NO 2 monitoring stations were associated with a negative trend of ≥ −2 μg m −3 year −1 ( Maji and Sarkar, 2020 ).

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