Spatiotemporal characteristics and socioeconomic factors of PM<sub>2.5</sub> heterogeneity in mainland China during the COVID-19 epidemic.

Chemosphere · 2023 · PMC10141970 · PMID 37121285

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a decreasing trendno p-value reported

Overall, the annual average PM 2.5 concentration in China showed a decreasing trend year by year, and the annual average PM 2.5 concentration in 2020 was reduced by nearly half compared with the most polluted year of 2014.

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