Ambient PM 2.5 Chemical Composition and Cardiovascular Disease Hospitalizations in China.

Little is known about the impacts of specific chemical components on cardiovascular hospitalizations. We examined the relationships of PM 2.5 chemical composition and daily hospitalizations for cardiovascular disease in 184 Chinese cities. Acute PM 2.5 chemical composition exposures were linked to higher cardiovascular disease hospitalizations on the same day and the percentage change of cardiovascular admission was the highest at 1.76% (95% CI, 1.36-2.16%) per interquartile range increase in BC, followed by 1.07% (0.72-1.43%) for SO 4 2- , 1.04% (0.63-1.46%) for NH 4 + , 0.99% (0.55-1.43%) for NO 3 - , 0.83% (0.50-1.17%) for OM, and 0.80% (0.34%-1.26%) for Cl - . Similar findings were observed for all cause-specific major cardiovascular diseases, except for heart rhythm disturbances. Short-term exposures to PM 2.5 chemical composition were related to higher admissions and showed diverse impacts on major cardiovascular diseases.