Study on the air pollution characteristics and potential sources in Yiyang City
This paper takes Yiyang City,one of the"key cities for air pollution prevention and control"in Hunan Province,as the research object to analyze the changes in the concentrations of atmospheric pollu-tants during the"13th Five-Year Plan"period,simulate the backward air mass trajectory and potential pol-lution sources.The results revealed that the overall changes in the concentrations of six conventional pollu-tants in Yiyang City showed a positive trend during the"13th Five-Year Plan"period.The overall concentra-tion of PM2.5 decreased,but its peak value remained high.Autumn and winter were the key periods for PM2.5 pollution in Yiyang City.O3 gradually became an important factor in air pollution,exceeding the pre-scribed upper limit mainly in April-May.The radar characteristic chart showed that the air pollutants in Yiyang City primarily manifested as burning-and motor vehicle-oriented characteristics in 2020.The daily variation of PM2.5,PM10,NO2,and CO all showed a"double peak"pattern.During the daytime with strong light radiation,the daily variation of O3 showed an opposite trend against that of NO2.There were obvious seasonal differences in trajectory clustering and pollutant concentration in different seasons.The po-tential sources of PM2.5 and PM10 were similar,mainly concentrated in the northeastern part of Hunan Province and the eastern part of Hubei Province.The potential sources of O3 were mainly distributed in the western part of Yiyang City.
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