Spatial characteristics of change trends of air pollutants in Chinese urban areas during 2016-2020: The impact of air pollution controls and the COVID-19 pandemic.

Atmos Res · 2023 · PMC9701570 · PMID 36465231

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an increasing trendno p-value reported

In addition, O 3 is a hazardous air pollutant with an increasing trend in China ( Li et al., 2019 ; Zhao et al., 2021 ).

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a decreasing trendno p-value reported

The overall change trend of UAP in China during 2016–2020 From 2016 to 2020, the concentrations of PM 2.5 , PM 10 , NO 2 , SO 2 , and CO (i.e., PM 2.5 , PM 10 , NO 2 , SO 2 , and CO in urban areas) all showed a decreasing trend ( Table 2 ), whereas O 3 showed an increasing trend.

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