Spatiotemporal variations of air pollutants based on ground observation and emission sources over 19 Chinese urban agglomerations during 2015-2019.

Sci Rep · 2022 · PMC8915768 · PMID 35277593

Europe PMC DOI

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an increasing trendno p-value reported

During the study period, the NO x emissions of most UAs decreased, but the CY, CG and CC UAs in the southwest, WSS in the eastern and BG UAs all showed an increasing trend of NO x .

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a decreasing trendno p-value reported

The slope value depicted a decreasing trend in the annual mean PM 2.5 and PM 10 during 2015–2019, suggesting that the emissions of particulate matter were effectively controlled.

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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.