Pollution characteristics,source apportionment and health risk of polycyclic aromatic hydrocarbons in PM2.5 around a transportation hub in a city of Northwest China
Objective To understand the pollution characteristics and sources of polycyclic aromatic hydrocarbons(PAHs)in PM2.5 in the air around a transportation hub in a city of northwest China in different seasons,and to know the health risks of people.Methods The samples were collected continuously for 7 days in different seasons in 2021 to detect the concentration of 16 polycyclic aromatic hydrocarbon(PAH)monomers in PM2.5.The source of PAHs was traced by using the characteristic group ratio method,and the equivalent method recommended by the US Environmental Protection Agency was used to evaluate the lifetime carcinogenic health risks of each monomer to humans.Results There was no statistical significance in the concentration of polycyclic aromatic hydrocarbons in different sampling points(P＞0.05),and the difference in polycyclic aromatic hydrocarbon concentrations in different seasons of the same sampling point was statistically significant(P＜0.05),and the winter concentration was significantly higher than that in other seasons.Polycyclic aromatic hydrocarbons attached to PM2.5 in the atmosphere around the two sampling points are affected by traffic sources and coal combustion,and the impact on the population increases with the age of the population.At the same time,people's health was more susceptible to PAHs in autumn and winter.Conclusion In 2021,the high pollution level of PAHs at the sampling points was mainly due to the compound pollution effects of traffic sources and coal combustion,and the health risks of the exposed populations were positively correlated with the increase in age,and the exposed populations in autumn and winter were more susceptible to the impact of polycyclic aromatic hydrocarbon pollution.
Transportation hubPolycyclic aromatic hydrocarbonsSource parsingPopulation health risksFine particulate matter
NETL
NSTL
万方数据
