Impact of PM_2.5 and ozone on incidence of influenza in Shijiazhuang, China: a time-series study.

In terms of other pollution factors, especially in 2017, 2018, and 2019, the fluctuation range had a decreasing trend, which indicated that Shijiazhuang had a good control over air pollution in recent years due to the proposal of blue sky protection and the implementation of relevant national policies, and the air pollution situation has been improved.

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The number of influenza cases showed an increasing trend year by year, with only a slight decline in 2017.

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