典型港口城市大气PM2.5组分特征及来源解析OA

To investigate the chemical composition and pollution sources of atmospheric PM2.5 in coastal port cities,PM2.5 samples collected in Liangyungang City from December 2020 to January 2021 during the winter heating period were analyzed.The results showed that the main chemical components of PM2.5 in Lianyungang include organic carbon(OC),elemental carbon(EC),water-soluble ions(SO42-,NO3-,NH4+),and crustal elements(Si,Al),with OC and EC making up a significant proportion.Strong correlations between OC and EC were observed under both clean and polluted conditions.Source apportionment indicated that the main sources of PM2.5 were secondary formation(24.6％),motor vehicle emissions(21.1％),coal and biomass combustion(17.2％),industrial sources(14.5％),ship emissions(11.9％),dust(5.9％),and marine sources(4.8％).Backward trajectory analysis identified eastern Shandong,northern Anhui,and central Jiangsu as potential source regions.To better control PM2.5 pollution,it is recommended that port cities strengthen regional cooperation,especially during winter heating,by sharing air quality data with neighboring cities.Promoting green transportation and energy transition,along with stricter control of port and ship emissions,will help improve air quality and provide guidance for pollution control in other coastal port cities.