Air pollution and critical air pollutant assessment during and after COVID-19 lockdowns: Evidence from pandemic hotspots in China, the Republic of Korea, Japan, and India.

Atmos Pollut Res · 2021 · PMC7695571 · PMID 33281465

Europe PMC DOI

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a decreasing trendno p-value reported

The mean AQI for NO 2 for the BF, LD, and AF periods for the three years showed a decreasing trend.

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an increasing trendno p-value reported

With the exception of Mumbai, the mean AQI for O 3 for the BF, LD, and AF periods for the three years showed an increasing trend.

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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.