The contributions of non-methane hydrocarbon emissions by different fuel type on-road vehicles based on tests in a heavily trafficked urban tunnel
Automobile exhaust is a major source of volatile organic compounds (VOCs) in metropolitan areas, yet it is difficult to accurately determine the contributions of different types of on-road vehicles. Tunnel tests are an effective way to measure real-world vehicle emissions, and the data collected are also suitable for receptor modeling to analyze the contributions of non-methane hydrocarbons (NMHCs) from different types of vehicles, as the closed environment ensures good mixing and minimal aging. In this study, tunnel tests were conducted inside a heavily trafficked city tunnel in Guangzhou in south China, and the positive matrix factorization (PMF) model was applied to the inlet-outlet incremental NMHC data. The results revealed that gasoline vehicles (GVs), Liquefied Petroleum Gas vehicles (LPGVs), and diesel vehicles (DVs) were responsible for 39 %, 45 % and 16 % of NMHCs, and 52 %, 23 %, and 24 % of the ozone formation potentials, respectively. LPGVs were the largest contributor of (56 %) alkanes, and GVs were the largest contributor of aromatics (61 %) and C₂-C₄ alkenes (55 %). With the video-recorded traffic counts the emissions of different fuel types are further compared on a per-vehicle-per-kilometer basis, and the results reveal that LPGVs and GVs were comparable in the OFPs of NMHCs emitted per kilometer, while on average a DV emitted 2.0 times more NMHCs than a GV with 2.4 times more OFPs. This study highlights substantial contribution of reactive alkenes and aromatics by DVs and the benefits of strengthening diesel exhaust control in terms of preventing ozone pollution.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00489697
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Supplemental Notes:
- © 2023 Elsevier B.V. All rights reserved. Abstract reprinted with permission of Elsevier.
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Authors:
- Xiao, Shaoxuan
- Zhang, Yanli
- Zhang, Zhou
- Song, Wei
- Pei, Chenglei
- Chen, Duohong
- Wang, Xinming
- Publication Date: 2023-5-15
Language
- English
Media Info
- Media Type: Web
- Features: Appendices; Figures; References;
- Pagination: 162432
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Serial:
- Science of the Total Environment
- Volume: 873
- Issue Number: 0
- Publisher: Elsevier
- ISSN: 0048-9697
- Serial URL: http://www.sciencedirect.com/science/journal/00489697
Subject/Index Terms
- TRT Terms: Emissions testing; Exhaust gases; Hydrocarbons; Internal combustion engines; Motor fuels; Vehicular tunnels
- Geographic Terms: Guangzhou (China)
- Subject Areas: Environment; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01880853
- Record Type: Publication
- Files: TRIS
- Created Date: Apr 24 2023 4:19PM