淮北市大气污染物异质性分析及其健康风险评价

Health Risk Assessment and the Heterogeneity of Air Pollutants in Huaibei City

通过分析2018年淮北市6种大气污染物(NO 2,SO 2,CO,O 3,PM 10,Pm^2.5)不同时间尺度的变化规律,结合耦合协调度、障碍度模型,探究大气污染物间的相互关系、诊断首要障碍因子,并对大气污染物中颗粒物的健康风险进行评估。结果表明:2018年淮北市大气污染物中O 3和PM 10分别超标104d和54d,仅Pm^2.5较之2017年超标天数下降约42%;NO 2、CO、SO 2、Pm^2.5和PM 10在各季节变化趋势基本一致,均呈双峰型,且浓度值在冬季最大,夏季最小;全年中大气氧化性是以O 3主导;2018年淮北市大气污染物耦合协调度处于拮抗/严重失调阶段,首要障碍因子为PM 10、Pm^2.5和SO 2;2018年淮北市大气污染物中Pm^2.5的健康风险值高于PM 10,但二者均未超过美国国家环境保护局(USEPA)规定的1.00×10^-6~1.00×10^-4可接受风险范围。

By analyzing the hourly variation of six atmospheric pollutant average concentration(NO 2,SO 2,CO,O 3,PM 10,Pm2.5)in Huaibei city at different seasons in 2018,and by the coupling coordination degree and obstacle degree model,the relationship between air pollutants is explored,and the primary obstacle factors were diagnosed,finally,the health risks assessment values of particulate matter in atmospheric pollutants were evaluated.The result shows:The days of exceeding the standard of O 3 and PM 10 are 104 and 54 days respectively,only Pm^2.5 is about 42%less than that in 2017,in Huaibei city.The bimodal trends of NO 2,CO,SO 2,Pm^2.5 and PM 10 are basically the same in different season,and the average concentration are the largest in winter and the smallest in summer.Atmospheric oxidation is dominated by O 3 in different seasons.The coupling degree of atmospheric pollutants in Huaibei city is basically maintained in the antagonistic stage,and the coordinating degree mainly shows the serious disorder,the primary obstacle factors are PM 10,Pm^2.5 and SO 2.The health risk value of Pm^2.5 in the air pollutants in Huaibei city is higher than PM 10,but neither exceeds the acceptable risk range of U.S.Environmental Protection Agency(USEPA),which is 1.00×10^-6~1.00×10^-4.