Opposite impact of emission reduction during the COVID-19 lockdown period on the surface concentrations of PM<sub>2.5</sub> and O<sub>3</sub> in Wuhan, China.

Environ Pollut · 2021 · PMC8326756 · PMID 34358865

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an increasing trendno p-value reported

From January to April in 2019, NO 2 declined gradually, while HCHO remained stable, which resulted in a slightly decreasing trend for O x and an increasing trend for O 3 .

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