Characteristics and sources apportionment of PM2.5-bound PAHs in Kunming

A set of PM2.5 samples from three sampling sites belonging to the regional air monitoring networks of Kunming were collected during April 2013 to January 2014, and 16selected PAHs were analyzed by GC-MS. Average concentrations of PM2.5-bound PAHs from the industrial area (Jinding Mountain), traffic area (Dongfeng Tung Road) and clean area (Xishan Forest Park) were 40.67, 22.64, 22.07 ng/m3. High atmospheric pressure and the input of air mass originated from the Qujing area were the cause of rising PAHs concentration in Kunming. Result of health risk assessment of PAHs showed, the concentration of BaPeq at Jinding Mountain, Dongfeng Tung Road and Xishan Forest Park was 6.28, 4.00, 2.94 ng/m3, respectively, exceeded the national ambient air quality standard (2.5 ng/m3) in China. The PAHs in industrial area and traffic area were mainly influenced by vehicle emission (50.80% and 40.20%), followed by coal combustion (35.55% and 39.23%), biomass combustion (7.30% and 7.98%); clean area was effected by vehicle emission (81.84%) and biomass combustion (9.73%). ©, 2015, Chinese Society for Environmental Sciences. All right reserved.