The impact of the COVID-19 outbreak on the air quality in China: Evidence from a quasi-natural experiment.

J Clean Prod · 2021 · PMC8020570 · PMID 33840917

Europe PMC DOI

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a decreasing trendno p-value reported

Air pollutants show a decreasing trend in 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.