Exposure Risk of Global Surface O<sub>3</sub> During the Boreal Spring Season.

Expo Health · 2022 · PMC8800438 · PMID 35128147

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a decreasing trendno p-value reported

A positive value of S -statistics indicates an increasing trend, whereas a negative value indicates a decreasing trend.

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an increasing trendno p-value reported

The results indicated that: in the boreal spring season from 2015 to 2020, the global O 3 concentration exhibited an increasing trend at a rate of 0.6 μg/m 3 /year because of the volatile organic compounds (VOCs) and NOx changes caused by human activities.

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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.