Health and related economic benefits associated with reduction in air pollution during COVID-19 outbreak in 367 cities in China.

Ecotoxicol Environ Saf · 2021 · PMC8241793 · PMID 34229169

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an increasing trendno p-value reported

Another study also reported an increasing trend of O 3 3 μg/m3/year in North and Southwest China from 2013 to 2017( Liu et al., 2020 ), while there was a decrease in NOx emissions in the same period ( Li et al., 2019 ).

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