Association between air pollution and hypertension hospitalizations: a time series analysis in Lanzhou.

During the study period, the number of hypertension hospitalizations showed an increasing trend and fluctuated with the seasons.

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The daily average concentrations of PM 2.5 , PM 10 , SO 2 and CO generally show a decreasing trend year by year, while NO 2 and O 3 show an increasing trend year by year.

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