Analysis of Pollution Characteristics and Potential Sources of Atmospheric Particulate Matter in Qingdao

Based on the atmospheric particulate matter mass concentration of Shandong Qingdao from January 2017 to December 2020， the conventional meteorological observation data and GDAS data， the pollution characteristics of atmospheric particulate matter in this area are studied， and the transmission path of atmospheric particulate matter in Qingdao are analyzed based on HYSPLIT model and TrajStat software.the potential source area and concentration contribution are studied by the Potential Source Contribution Function （PSCF） and Concentration Weighted Trajectory （CWT）.The research findings show： （1） The average annual value of PM2.5 mass concentration in Qingdao was 35.3 µg·m-3.The mass concentration was the highest in winter， followed by spring and autumn， and the lowest in summer.The annual exceeding standard rates of PM2.5 mass concentration were 8.22%， 7.40%， 11.51% and 7.38% respectively.The heavy pollution days only occurred in winter and the pollution days never occurred in summer.（2） The seasonal and diurnal