Pollution characteristics,source apportionment,and risk assessment of PM2.5 in urban district and county of Suzhou city from 2018 to 2022
Objective To understand the pollution characteristics and source of metal and metalloid,polycyclic aromatic hydrocarbons(PAHs)and water-soluble inorganic ions(WSIIs)in PM2.5in urban district and county of Suzhou City,and to know the health risks of PM2.5 to the local residents.Methods Ambient PM2.5 samples in the investigatedurban district and county of Suzhou city were collected from 10th to 16th every month from January 2018 to December 2022.The concentrations of PM2.5 and thetoxic components were detected by weighing method,ion chromatography and liquid chromatography,respectively.The pollution sources of PM2.5 were determined by the PMF model.And the health risks of PM2.5 were assessed by the recommended USA EPA model.Results The annual concentrations of PM2.5 in urban district and county of Suzhou City from 2018 to 2022 were 40.00 μg/m3 and 43.00 μg/m3,respectively,and their exceedance rates were 17.72％and 17.89％,respectively(both P＞0.05).However,the concentrations of metal and metalloid and PAHs in PM2.5 in county were higher than that in urban district(P＜0.05).The main pollution sources of PM2.5 in urban district were fossil fuel combustion and traffic emission,and the main sources of PM2.5 in county were fossil fuel combustion and industrial emission.The HQ values of PM2.5-bound metal and metalloid in both urban district and county were all less than 1,with lower non-carcinogenic risk.The CR values of Cd,Pb and Ni were less than 1×10-6,which could be acceptable carcinogenic risk level for the local residents.However,the CR values of As and PAHs were greater than 1 ×10-6,with potential carcinogenic risk for the local residents.Conclusion Ambient PM2.5 pollution exists in urban and county areas of Suzhou City,but the main pollution source spectrum is different.Due to the potential carcinogenic risk for the local residents,the control measures of the main pollution sources of As and PAHs should be strengthened.
Particulate matterMetal and metalloidPolycyclic aromatic hydrocarbonsSource apportionmentHealth risk assessment
NETL
NSTL
万方数据
