Ozone pollution in the North China Plain spreading into the late-winter haze season.

Proc Natl Acad Sci U S A · 2021 · PMC7958175 · PMID 33649215

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an increasing trendno p-value reported

3 shows an increasing trend of maximum MDA8 ozone in March from 2013 to 2019, demonstrating the growing northward spread of ozone pollution into the winter haze season, with extensive exceedances of the air quality standard.

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