Study On The Morphology Of Atmospheric Particles And Seasonal Distribution Characteristics Of Pollutants In Taiyuan

This study investigated the seasonal distribution characteristics of atmospheric particulate matter and pollutants in Taiyuan City,and selected Wuyi Square(traffic area)and Jinci Park(leisure area)as regional samples of specific functions in spring,summer and autumn in 2018.In the winter,collect PM10 and PM2.5 particulate matter in the ambient air of the above-mentioned areas,analyze the concentration,morphology and surface heavy metal content of different particle sizes,and screen the composition of semi-volatile organic compounds in the particulates for specific regions.On this basis,through the human body exposure health risk assessment of PM2.5 particles in the ambient air of Taiyuan City,the current situation of atmospheric particulate pollution in Taiyuan City is obtained.At the same time,based on the data collected and analyzed,the pollution source of atmospheric particulate matter is analyzed,and the key pollution sources are deduced to provide a scientific basis for atmospheric environmental management in Taiyuan City.Research indicates:In the two functional areas surveyed,the PM2.5 level of particulate matter concentration was 155.83±37.42?g/m3 in the Wuyi Square in the traffic area and 75.48±27.36?g/m3 in the Jinci Park in the leisure area;the PM10 level of particulate matter concentration,traffic area It was 222.17±24.41 ?g/m3 and the leisure area was 129.33±24.32 ?g/m3.The pollution of PM10 and PM2.5 in different functional zones in different functional areas is represented as traffic area> leisure area.It can be seen that the concentration of large particles in the traffic area is significantly greater than the other functional areas.The daily average concentrations of PM10 and PM2.5 in the two functional zones showed a consistently higher winter than in the other three seasons.The atmospheric particulate matter in Taiyuan City is dominated by five types of soot agglomerates,mineral single particles,floc aggregates,cluster-like aggregates and spherical particles.Among them,the fine particles in the atmospheric particles in the traffic area and the leisure area accounted for 63.5%,39.1% and 27.5% of the total coarse particles.It is worth mentioning that the atmospheric particulate matter in the traffic area is dominated by fine particulate matter,and the source of emissions due to human production activities is the main source of pollutants.By analyzing the contents of seven heavy metal elements in atmospheric particulates in Taiyuan City,the contents of Fe,(2.001?g/m3)and Zn(2.001?g/m3)in PM2.5 are significantly higher than other elements(Cu,Cr).,Pb,Mn,Ni)content.The element content in PM10 is basically consistent with the content of PM2.5.The heavy metal content in the traffic area is relatively high,and the heavy metal content in the leisure area is relatively low.The time regularity is winter(heating period)> autumn(non-heating period)> spring> summer.In this paper,through the human body exposure health risk assessment of heavy metal elements in PM2.5,we can further understand the harm of heavy metal elements in Taiyuan City.And through the screening of semi-volatile organic compounds in the particles,more accurate search for pollution sources,more effectively provide a scientific basis for the governance of Taiyuan City's atmospheric environment.