Abstract:  Based on the source apportionment of PM2.5 in Hefei in 2018, the contribution coefficient of civil bulk coal toρ(PM2.5) was figured out, and the effect of replacing bulk coal on air quality improvement was evaluated，which provided reference for alternative energy study. The results showed that the main sources of PM2.5 in Hefei included secondary pollution sources and primary pollution sources such as vehicle emission, soot dust, and crust dust. Their contribution to PM2.5 source were 37.80%, 33.70%, 19.60%and 8.90%，respectively. Since 2014 to 2018, 2802GW·h electricity, mainly in manufacturingof industrial(agricultural) industry,was replaced. After the implementation of alternative energy, the average concentration of PM2.5 decreased year by year, and concentrations in spring and winter were higher than those in summer and autumn.The concentration in summer was the lowest.The contribution of bulk coal to the concentration of atmospheric PM2.5 in 2014 and 2018 were 9.07 and 4.33μg/m3, respectively, which showed a 4.74μg/m3 decrease. The alternative energy is an effective way to improve the air quality of Hefei. Contribution of vehicle emissions to atmospheric PM2.5 should be highly valued in pollution control. More efforts should be made to promote alternative energy in transportation sector.

Key words:  font-family: "Times New Roman", serif;">alternative energy, source apportionment of PMfont-family: "Times New Roman", serif;">2.5font-family: "Times New Roman", serif;">, air pollution, bulk coal;vehicle, Hefei City