Objective To evaluate the effect of fine particulate matters (PM2.5) on the daily mortality of circulatory diseases in Zhoushan City.
Methods Data on daily mortality of circulatory diseases, daily air pollution (PM2.5, SO2, and NO2), and meteorological factors (average temperature and relative humidity) during 2014 in Zhoushan were collected. Generalized additive model (GAM) was used to analyze the association between PM2.5 concentration and circulatory disease daily mortality.
Results The daily PM2.5 level in selected city was 31.22 μg/m3 in 2014, which met the primary standard of Ambient Air Quality Standard (GB 3095-2012). During cold season (from January to April, and from November to December), the atmospheric pollutant concentrations were high and strongly linked with the daily mortality of circulatory diseases. The death toll for circulatory diseases was 2120 in 2014. The majority of them (>85%) were older than 65 years. Circulatory disease mortality increased by 2.46% (95%CI:0.36%-4.55%) for per 10μg/m3 increase in PM2.5. The relationships between circulatory disease mortality and PM2.5 concentrations in the total population and the residents ≥ 65 years were stronger on lag 2 days and in cold season compared with warm season (from May to October).
Conclusion Short-term ambient PM2.5 exposure is associated with higher circulatory mortality in Zhoushan City, especially for the elderly. The effect is stronger in cold season than in warm season.
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