Trends in ambient air pollution levels and PM<sub>2.5</sub> chemical compositions in four Chinese cities from 1995 to 2017.

J Thorac Dis · 2020 · PMC7656343 · PMID 33209477

Europe PMC DOI

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a decreasing trendno p-value reported

Although O 3 concentration in WH appeared to be on a decreasing trend, it was in a high concentration range (between 80 and 100 μg/m 3 ).

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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.