Characteristics and sources of PM_(2.5) and carbonaceous species during winter in Taiyuan, China

摘要

Continuous observation of PM_(2.5) was conducted in Taiyuan, a heavily polluted city in China, during high pollution season from December 2005 to February 2006. The results of this study showed that PM_(2.5) and carbonaceous species pollution were serious during winter in Taiyuan. The organic carbon (OC) and element carbon (EC) were accounted for 18.6 ± 11.2% and 2.9 ± 1.6% of PM_(2.5), respectively, which indicated that carbonaceous aerosols were key components for control fine particles pollution in Taiyuan. Coal combustion was a dominant source of OC and EC of PM_(2.5) in the urban area of Taiyuan during winter. The impact of local and remote particle sources on urban air quality was assessed using PM_(2.5) concentration rose and 3-day back trajectories of air masses arriving at Taiyuan. The meteorological conditions were found to affect the ambient concentrations of PM_(2.5), OC, EC and OC/EC ratio.