Effects of Early Pollution Control Measures on Secondary Species of PM<sub>2.5</sub> in Jiaozuo, China.

The average winter concentrations of PM 2.5 were 1.0–1.3, 1.4–3.0, and 1.5–2.7 times those of other seasons in 2013–2014 (autumn 2013 to summer 2014), 2015–2016 (autumn to summer), and 2018–2019 (winter to autumn), respectively. Meanwhile, it showed a decreasing trend for the seasonal concentrations of PM 2.5 in the same period.

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With the implementation of the policy, the seasonal O 3 concentration in all cities showed an increasing trend.

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