Source Apportionment of PM_(2.5) in Beijing during 2012-2013

摘要

Eight sources contributing to ambient PM_(2.5) in Beijing during 2012-2013 were identified, which include metallurgical emission, biomass combustion, traffic emission, secondary sulfateitrate, coal combustion, Asian dust, industrial emission, and road dust. The contributions to PM_(2.5) of these eight sources were 7.4%, 13.8%, 23.1%, 32.5%, 17.2%, 0.8%, 2.6%, and 2.6%, respectively. From the mass concentration perspective, traffic emission and secondary sulfateitrate sources were higher in the winter. Asian dust and road dust were higher in the spring, and coal combustion and industrial emission were greater in the heating season compared to other seasons. Biomass combustion was dominant during the summer. Next steps include analyzing local source impacts from various wind direction based on source contribution estimates from PMF and wind direction values, and comparing the PMF source apportionment results with the Community Multi-scale Air Quality (CMAQ) model results.