Changes in Air Quality and Drivers for the Heavy PM<sub>2.5</sub> Pollution on the North China Plain Pre- to Post-COVID-19.

Int J Environ Res Public Health · 2022 · PMC9566441 · PMID 36232204

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a decreasing trendno p-value reported

As for NO 2 , the annual-average concentrations in Beijing showed a decreasing trend during 2017–2020, from 44 μg m −3 in 2017 down to 28 μg m −3 in 2020.

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