Significant concurrent decrease in PM<sub>2.5</sub> and NO<sub>2</sub> concentrations in China during COVID-19 epidemic.

J Environ Sci (China) · 2021 · PMC7328636 · PMID 33183713

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a decreasing trendno p-value reported

SO 2 also showed a decreasing trend, with the most obvious decrease observed in the North China Plain.

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