Pollution characteristics and health risk assessment of polycyclic aromatic hydrocarbons in atmospheric particulate matter PM2.5 in Baotou City in 2020
Objective To investigate the pollution levels,distribution characteristics,and sources of polycyclic aromatic hydrocarbons(PAHs)in atmospheric PM2.5 in Baotou City and their population health risks,and to provide a basis for pollution management in the region.Methods From January to December 2020,PM2.5 samples of atmospheric particulate matter were collected from the main city of Baotou,and the atmospheric PM2.5 concentrations and 15 PAHs components were regularly detected,and the daily average mass concentrations of different PAHs were analyzed descriptively.The sources of PAHs in PM2.5 were determined using the characteristic ratio method and the principal component extraction method,and the US EPA health risk model was used to assess their population health risk.Results The annual PM2.5 concentrations in Baotou ranged from 19.11 to 743.65 pg/m3,and the daily mass concentration[M(P25,P75)]was 83.27(55.79,175.70)µg/m3.15 PAHs were detected in varying degrees,ranging from 0.02 to 372.57 ng/m3,with a daily mass concentration of 18.49(9.16,99.23)ng/m3.The daily mass concentration of PAHs in PM25 in winter(249.90 ng/m3)＞autumn(25.59 ng/m3)＞summer(10.41 ng/m3)＞spring(8.73 ng/m3),with statistically significant differences(H=29.26,P＜0.05),and the composition was dominated on 4-6 rings.The main source of PAHs in PM2.5 was the compound pollution from coal-fired and motor vehicle emission sources,with a total carcinogenic risk of 1.83×10-4,which may have carcinogenic risk.Conclusion The pollution level of PAHs in atmospheric PMu in Baotou is high in winter,and attention should be paid on the carcinogenic risk of PAHs dose to human body in winter.
Fine particulate matterPolycyclic aromatic hydrocarbonsHealth risk assessment
NETL
NSTL
万方数据
