The spatiotemporal characteristics of the air pollutants in China from 2015 to 2019.

PLoS One · 2020 · PMC7444542 · PMID 32822345

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a negative trendno p-value reported

found that the relative changes in the median PM 2.5 in all provinces except Shanxi and Jiangxi from 2015 to 2017 showed a negative trend [ 17 ].

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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.