Effect of COVID-19 on air quality and pollution in different countries.

J Transp Health · 2021 · PMC7997706 · PMID 33816115

Europe PMC DOI

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an increasing trendno p-value reported

On the other hand, Ozone concentration showed an increasing trend due to lockdown, as opposed to the decrease of other pollutants.

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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.