Exposure Level and Health Risk Assessment of Major Air Pollutants in Xi'an City
To explore the exposure level and health risks of major air pollutants in Xi'an City,through air quality monitoring data and questionnaire survey data,the GIS method,U.S.EPA health risk assessment model and multiple linear regression model were used to analyze the temporal and spatial variation characteristics of six haze pollutants(PM2.5,PM 10,SO2,NO2,CO and O3)in Xi'an City from 2015 to 2020,and the average annual,seasonal health risks of six public pollutants and as well as their influencing factors were evaluated.The results showed that:① The concentration values of PM2.5,PM10 and NO2 in Xi'an from 2015 to 2020 all exceeded the second-level ambient air quality standards.Except for O3,the annual average concentration of the other five pollutants was the lowest in 2020,showing a trend of overall downward,indicating that the air quality of Xi'an improved year by year.② The spatial distribution of PM2.5 was coincided with PM10 and CO.Similarly,the distribution of SO2 and O3 were basically the same.Among the 13 monitoring sites,Jingkai district and Yanliang district had serious haze pollution,while Beilin district and Qujiang district had good air quality.③ The non carcinogenic risk index(HI)of five pollutants,PM2.5,PM1o,SO2,NO2 and CO,was highest in winter and lowest in summer;the HI of O3 was highest in summer and lowest in winter.In winter,the average HI values of PM2.5 and PM10 were both greater than 1,indicating a non carcinogenic health risk;the average HI values of four pollutants,SO2,NO2,CO and O3,were all less than 1,indicating no non carcinogenic health risk.In summer,there were non carcinogenic health risks associated with O3 values,with 4％of days exceeding the threshold;the average and maximum HI values of the remaining 5 pollutants were all less than 1,indicating no health risk hazards.From the annual average,the average HI values of the six pollutants were all less than l,indicating no non carcinogenic health risks.④ Men,outdoor professionals,and older adults were at higher risk of haze health.
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NSTL
万方数据
