In order to explore the pollution characteristics and sources of fine particulate matter(PM2.5)in Tangs-han,and promote the continuous improvement of air quality,based on the concentration data of fine particulate matter and its chemical components in Tangshan from 2019 to 2020,this paper analyzed its change rules and pol-lution characteristics,and applied the positive matrix factor model(PMF)to analyze the pollution sources.The re-sults showed that PM2.5 showed an overall improvement trend during the study period,but the average annual con-centration of PM2.5 still exceeded the national secondary standard,and PM2.5 was the main object of air pollution prevention and control.During the study period,the proportion of carbon components in PM2.5 ranged from 19.75%to 20.29%,in which OC reached three quarters.The average annual concentration of three inorganic salt components accounted for more than 70%of PM2.5 concentration,and NO-3 accounted for the largest proportion.Inorganic elements accounted for 5%to 6%of PM2.5.The time variation of the annual average concentration of PM2.5 and its components were generally consistent,showing a downward trend.The source analysis results showed that there were six main sources of PM2.5 pollution in Tangshan:secondary aerosol,dust source,biomass combustion,coal source,motor vehicle exhaust and industrial smelting dust.On the whole,the atmospheric PM2.5 in Tangshan were mainly affected by secondary aerosols,coal sources and vehicle exhaust emissions.Among them,the most influential pollution source was secondary aerosol.Affected by steel coking enterprises and bulk material transportation,coal burning and motor vehicle exhaust also had a greater impact on PM2.5 in Tangshan.
fine particulate mattercomponent characteristicssource analysisTangshan City
维普
万方数据
