| Title: | Intermediate volatile organic compounds emissions from vehicles under real world conditions |
| Author(s): | Tang J; Li Y; Li X; Jing S; Huang C; Zhu J; Hu Q; Wang H; Lu J; Lou S; Rao P; Huang D; |
| Address: | "College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China. State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China. Electronic address: Liyj@saes.sh.cn. Key Laboratory for Power Machinery and Engineering of M.O.E, Shanghai Jiao Tong University, Shanghai 200240, China; Institute of Eco-Chongming (IEC), Shanghai 202162, China. Electronic address: Lxl@sjtu.edu.cn. State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China. Environmental Health Science and Research Bureau, Health Canada, Ottawa, Ontario K1A0K9, Canada. College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China. Electronic address: Raopinhua@sues.edu.cn" |
| DOI: | 10.1016/j.scitotenv.2021.147795 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Real-world vehicle emission factors (EFs) for the total intermediate volatile organic compounds (total-IVOCs) and volatile organic compounds (VOCs) from mixed fleets of vehicles were quantified in the Yangtze tunnel in Shanghai. Relationships of EFs of IVOCs with fleet compositions and vehicle speed as well as secondary organic formation potentials (SOAFPs) from IVOCs and VOCs were studied. Multiple linear regression (MLR) was used to estimate EFs of total-IVOCs for gasoline and diesel vehicles. IVOCs were classified into unresolved complex mixtures (unspeciated cyclic compounds and branched alkanes (b-alkanes)) and speciated targets (11 n-alkanes and ten polycyclic aromatic hydrocarbons (PAHs)). The results showed that the average EF of total-IVOCs was 24.9 +/- 7.8 mg/(km.veh), which was comparable to that of VOCs. Unspeciated cyclic compounds and b-alkanes dominated the main composition (~77% and ~19%), followed by n-alkanes (~4%) and PAHs (~1%). EFs of IVOCs showed a significant, positive relationship with diesel vehicle fractions (p < 0.05). EFs of IVOCs dropped notably with the decrease of the diesel vehicle fractions. SOAFP produced by the total organic compounds (IVOCs + VOCs) was 8.9 +/- 2.5 mg/(km.veh), in which up to 86% of SOAFP was from IVOCs. Estimated EFs of total-IVOCs for gasoline vehicles and diesel vehicles were 15.3 and 219.8 mg/(km.veh) respectively. Our results demonstrate that IVOCs emitted from diesel vehicles are the main emission sources under real world conditions and significant contributions of IVOCs emissions to SOA formation is evident, which indicates the necessity of making control policies to reduce IVOCs emissions from vehicles" |
| Keywords: | Emission factors (EFs) Intermediate volatile organic compounds (IVOCs) N-alkanes Polycyclic aromatic hydrocarbons (PAHs) Unspeciated complex mixtures (UCM); |
| Notes: | "PubMed-not-MEDLINETang, Jianyi Li, Yingjie Li, Xinling Jing, Sheng'ao Huang, Cheng Zhu, Jiping Hu, Qingyao Wang, Hongli Lu, Jun Lou, Shengrong Rao, Pinhua Huang, Dandan eng Netherlands 2021/06/18 Sci Total Environ. 2021 Sep 20; 788:147795. doi: 10.1016/j.scitotenv.2021.147795. Epub 2021 May 15" |
