Spatial-temporal distribution patterns and influencing factors analysis of comorbidity prevalence of chronic diseases among middle-aged and elderly people in China: focusing on exposure to ambient fine particulate matter (PM_2.5).

Results PCMC in China showing a decreasing trend.

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This indicates that the efforts made by the Chinese government in controlling air pollution have been successful, and there is a positive trend in improving air quality in China.

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This study further conducted Getis-Ord General G calculation, but the results for four years did not show significance, indicating that there may not be significant high-value or low-value clustering areas nationally.

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