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Sci Total Environ

Title:		Primary emissions and secondary organic aerosol formation from in-use diesel vehicle exhaust: Comparison between idling and cruise mode
Author(s):		Deng W; Fang Z; Wang Z; Zhu M; Zhang Y; Tang M; Song W; Lowther S; Huang Z; Jones K; Peng P; Wang X;
Address:		"State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom. South China Institute of Environmental Science, Ministry of Ecology and Environment, Guangzhou 510655, China. Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China. Electronic address: wangxm@gig.ac.cn"
Journal Title:		Sci Total Environ
Year:		2020
Volume:		20190907
Issue:
Page Number:		134357 -
DOI:		10.1016/j.scitotenv.2019.134357
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Diesel vehicle exhaust is an important source of carbonaceous aerosols, especially in developing countries, like China. Driving condition impacts diesel vehicle emissions, yet its influence needs further understanding especially on secondary organic aerosol (SOA) formation. In this study tailpipe exhaust from an in-use light duty diesel vehicle at idling and driving speeds of 20 and 40?ª+km?ª+h(-1) was introduced respectively into a 30?ª+m(-3) indoor smog chamber to investigate primary emissions and SOA formation during photo-oxidation. The emission factors of SO(2) at 20 and 40?ª+km?ª+h(-1) were higher than those at idling, whereas the emission factors of aromatic hydrocarbons (AHs), polycyclic aromatic hydrocarbons (PAHs) and oxygenated volatile organic compounds (OVOCs) decreased when driving speeds increased. The emission factors of black carbon (BC) and primary organic aerosol (POA) at idling were comparable to those at 20 and 40?ª+km?ª+h(-1). The SOA production factors were 0.41?ª++/-?ª+0.09?ª+g?ª+kg-fuel(-1) at idling, approximately 2.5 times as high as those at 20?ª+km?ª+h(-1) (0.16?ª++/-?ª+0.09?ª+g?ª+kg-fuel(-1)) or 40?ª+km?ª+h(-1) (0.17?ª++/-?ª+0.09?ª+g?ª+kg-fuel(-1)). Total carbonaceous aerosols, including BC, POA and SOA, from diesel vehicles at 20 and 40?ª+km?ª+h(-1) were 60-75% of those at idling, due largely to a reduction in SOA production. Measured AHs and PAHs altogether were estimated to explain <10% of SOA production, and eight major OVOCs could contribute 8.4-23% of SOA production. A preliminary comparison was further made for the same diesel vehicle at idling using diesel oils upgraded from China 3 to China 5 standard. The emission factors of total particle numbers decreased by 38% owing to less nuclei mode particles, which was probably caused by the reducing fuel sulfur content; the emission factors of BC were almost unchanged, the POA emission factors and SOA production factors however decreased by 72% and 37%"
Keywords:		Cruise mode Diesel vehicle exhaust Idling mode Primary emissions Secondary organic aerosol;
Notes:		"PubMed-not-MEDLINEDeng, Wei Fang, Zheng Wang, Zhaoyi Zhu, Ming Zhang, Yanli Tang, Mingjin Song, Wei Lowther, Scott Huang, Zhonghui Jones, Kevin Peng, Ping'an Wang, Xinming eng Netherlands 2019/11/05 Sci Total Environ. 2020 Jan 10; 699:134357. doi: 10.1016/j.scitotenv.2019.134357. Epub 2019 Sep 7"