Pollution Characteristics and Health Risk Assessment of Heavy Metal in Atmospheric PM2.5 in Urumqi
In order to investigate the current pollution levels,sources,health risks and trends of heavy metals in atmosph-eric PM2.5 in Urumqi,continuous monitoring of heavy metals in PM2.5 in four seasons in a typical representative area of Urumqi was conducted to analyse the pollution characteristics,sources and health risks of heavy metals in PM2.5.The results show that the annual average value of PM2.5 in 2020 exceeded the class Ⅱ limit value of 35 μg/m3 set by China's Ambient Air Quality Standard(GB3095-2012).The concentration of each element was the highest in winter and the lowest in summer.Cu,Cr,Zn,Mn were the most abundant elements in PM2.5.The total content of heavy metals in the monitoring points of #1(traffic road area),#2(industrial concentration area),and #3(agricultural area)accounted for 1.57％,2.48％,and 0.68％of the mass concentration of PM2.5,respectively,i.e.,the heavy metal content in PM2.5 in the three monitoring points ranged in descending order as 2# monitoring point＞1# monitoring point＞3# monitoring point.The ILCR of Cr is＞10-4,which shows a carcinogenic risk for the whole group of people.The ILCR of Cd is in the range of 10-6～10-4,indicating acceptable levels,and the carcinogenic risk is negligible.The HQs of Mn and Cr are both＞1,showing non-carcinogenic risk.The HQs of the 7 heavy metals range as children＞male adults＞female adults,with all values less than 1,the non-carcinogenic risk is low and negligible.
UrumqiSource of PM2.5Heavy metalsPollution characteristicsHealth risk assessment
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NSTL
万方数据
