Impact of COVID-19 on air quality in the Yangtze River Delta, China.

Environ Monit Assess · 2021 · PMC8315727 · PMID 34318366

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a decreasing trendno p-value reported

The highest average PM 2.5 concentrations (110–120 μg/m 3 ) were observed in the northern YRD, and PM 2.5 concentrations in the YRD shows a decreasing trend from north to south during period I.

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an increasing trendno p-value reported

Total column water vapor shows an increasing trend from January to May, 2020.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.