Gasoline vehicle exhaust is an important contributor to secondary organic aerosol (SOA) formation in urban atmosphere. Fuel composition has a potentially considerable impact on gasoline SOA production, but the link between fuel components and SOA production is still poorly understood. Here, we present chamber experiments to investigate the impacts of gasoline aromatic content on SOA production through chamber oxidation approach. A significant amplification factor of 3-6 for SOA productions from gasoline exhausts is observed as gasoline aromatic content rose from 29 to 37 %. Considerably higher emission of aromatic volatile organic compounds (VOCs) using high-aromatic fuel plays an essential role in the enhancement of SOA production, while semi-volatile organic compounds (e.g., gas-phase PAHs) may also contribute to the higher SOA production. Our findings indicate that gasoline aromatics significantly influence ambient PM2.5 concentration in urban areas and emphasize that more stringent regulation of gasoline aromatic content will lead to considerable benefits for urban air quality.
ISI Document Delivery No.: FN5YYTimes Cited: 3Cited Reference Count: 42Peng, Jianfei Hu, Min Du, Zhuofei Wang, Yinhui Zheng, Jing Zhang, Wenbin Yang, Yudong Qin, Yanhong Zheng, Rong Xiao, Yao Wu, Yusheng Lu, Sihua Wu, Zhijun Guo, Song Mao, Hongjun Shuai, ShijinPeng, Jianfei/F-1438-2015; Guo, Song/D-9218-2012; Wu, Zhijun/A-7041-2012Guo, Song/0000-0002-9661-2313;National Basic Research Program of China (973 Program) [2013CB228503, 2013CB228502, 2013CB955801]; National Natural Science Foundation of China [91544214, 51636003, 41421064]; Chinese Academy of Sciences [XDB05010500]; China Postdoctoral Science Foundation [2015M580929]This work was supported by the National Basic Research Program of China (973 Program) (2013CB228503, 2013CB228502, 2013CB955801), the National Natural Science Foundation of China (91544214, 51636003, 41421064), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB05010500), and the China Postdoctoral Science Foundation (2015M580929). The authors thank Jianhua Xiao and Lei Deng at Tsinghua University for their contribution to this work.4822Copernicus gesellschaft mbhGottingen1680-7324