Pollution characteristics and health risk assessment of polycyclic aromatic hydrocarbons in atmospheric PM2.5 in Hohhot City,2021
Objective To understand the pollution and distribution characteristics of polycyclic aromatic hydrocarbons(PAHs)in atmospheric fine particulate matter(PM2.5)in Huimin District and Saihan District,Hohhot City in 2021,and to evaluate its risk for population health through respiratory pathway.Methods From the 10th to the 16th of each month in 2021,atmospheric PM2.5 samples were collected at monitoring points in the two urban districts.The mass concentrations of 16 PAHs were determined by high performance liquid chromatography.The incremental lifetime carcinogenic risk of PAHs was evaluated by toxic equivalent concentration,and the non-carcinogenic and carcinogenic health risk assessments were carried out for PAHs with toxicological parameters of the inhalation route.Results There was no statistically significant difference in the mass concentration of PM2.5 between the two districts,and the mass concentration of PAHs showed winter＞spring＞autumn＞summer.The highest proportion in winter and spring in the two urban districts was 4-ring PAHs,and the main sources were coal combustion,traffic emissions and biomass combustion.The value of incremental lifetime carcinogenic risk of PHAs in the whole city was 2.47 × 10-6 for men and 2.26×10-6 for women.The carcinogenic risk values of Bbf,Bap,DbahA and IcdP in winter and the whole year were 1.0×10-6-1.0×10-4,which were within the acceptable ranges of the population,but there were potential carcinogenic risks,and the carcinogenic risks were higher in men than in women.The non-carcinogenic risk values of BaP in autumn and winter were 1.28 and 2.10 respectively,but the annual non-carcinogenic risk was less than 1.The life expectancy loss due to PAHs in PM2.5 in Hohhot City in 2021 was 14.44 min for men and 15.10 min for women.Conclusion PAHs in atmospheric PM2.5 in the two urban districts of Hohhot City in 2021 had seasonal differences,and there were carcinogenic risks for the population and a non-carcinogenic risk of Bap in winter.
fine particulate matterpolycyclic aromatic hydrocarbonpopulationhealth risk
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