Ozone Pollution: A Major Health Hazard Worldwide.

Front Immunol · 2019 · PMC6834528 · PMID 31736954

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an increasing trendno p-value reported

For example, ozone measured at Mt Waliguan Observatory (a global “background” site) on the Tibetan Plateau over the period of 1994–2013 has shown an increasing trend at 0.2–0.3 ppb per year during spring and autumn ( 11 ).

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a decreasing trendno p-value reported

While annual PM 2.5 average concentrations showed a decreasing trend in many cities of China ( 12 ), ground-level ozone concentrations measured in some monitoring sites in China showed an increasing trend in the past several years.

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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.