高校学生大气颗粒物重金属个体暴露及健康风险OA

In order to evaluate the individual exposure level of PM2.5 of college students and the effects of heavy metals on human health more accurately,a portable atmospheric particulate matter monitor is used to monitor the exposure level of atmospheric particulate matter in college students'living environment.An individual sampling pump is used to collect PM2.5 samples carried by volunteers of college students and the concentration of heavy metals in PM2.5 are analyzed.The results show that the daily average value of PM1,PM2.5 and PM10 exposed by college students are 27.9,35.6 and 45.8 μg/m3,respectively,which do not exceed the 24-hour concentration limit of PM2.5in China.The concentrations of As,Cd and Pb in PM2.5 are lower than the limits of Chinese ambient air quality standards,but the concentrations of As exceed the standard limits on some days.The results of geoaccumulation index show that Cd is at seriously polluted to extreme pollution level,As is at serious pollution level,Cr is at moderate pollution level,and Sb is at light pollution level.The results of the Monte Carlo simulation of health risk assessment show that the comprehensive non-carcinogenic risk value of heavy metals is 1.46,which is outside the safe level of 1.The comprehensive carcinogenic risk value of heavy metals is 1.16×10-5,which is within acceptable levels.