Characterizing carbonyl compounds and their sources in Fuzhou ambient air, southeast of China.

PeerJ · 2020 · PMC7649009 · PMID 33194416

Europe PMC DOI

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a decreasing trendno p-value reported

At 3:00 p.m., the net HCHO generation rate showed a decreasing trend, indicating that the on-site HCHO generation rate was lower than the HCHO destruction rate.

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an increasing trendno p-value reported

However, ozone concentrations show an increasing trend year by year.

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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.