Anthropogenic drivers of 2013-2017 trends in summer surface ozone in China.

Proc Natl Acad Sci U S A · 2019 · PMC6329973 · PMID 30598435

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an increasing trendno p-value reported

The residual shows an increasing trend of 1–3 ppbv a −1 in urban areas of eastern China that we attribute to changes in anthropogenic emissions.

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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.