Effects of COVID-19 pandemic on the air quality of three megacities in India.

Atmos Res · 2021 · PMC9757857 · PMID 36568528

Europe PMC DOI

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an increasing trendno p-value reported

Air temperature exhibited an increasing trend from March to May in all three megacities; however, the trend was most prominent in Delhi.

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a decreasing trendno p-value reported

The post-lockdown concentration of PM 2.5 for Mumbai and Kolkata remained below the said permissible limit following a decreasing trend over time whereas, Delhi exhibited the opposite.

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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.