Fine particulate matter pollution characteristics and source apportionment of Changchun atmosphere

Abstract

13In order to study the pollution characteristics and main sources of fine particulate matter in the atmosphere of the city of 14 Changchun, PM2.5 samples were collected during the four seasons in 2014, and representative months for each season are 15 January, April, July, and October. Sample collection was carried out on 10 auto-monitoring stations in Changchun, and PM2.5 16 mass concentration, and its chemical components (including inorganic elements, organic carbon, elemental carbon, and water-17 soluble ions) were measured. The results show that the annual average mass concentration of PM2.5 in Changchun in 2014 18 was about 66.77 μg/m 3 . Organic matter was the highest component in PM2.5, followed by secondary inorganic ions (SNA), 19 mineral dust (MIN), elemental carbon (EC), and trace elements (TE). Positive Matrix Factorization (PMF) results gave seven 20 factors, namely, industrial, biomass-and coal-burning, industrial and soil dust, motor-vehicle, soil and secondary-ion, light-21