| Title: | On-board measurements of gaseous pollutant emission characteristics under real driving conditions from light-duty diesel vehicles in Chinese cities |
| Author(s): | Wang G; Cheng S; Lang J; Li S; Tian L; |
| Address: | "Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China. Electronic address: wanggang70@emails.bjut.edu.cn. Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China; Collaborative Innovation Center of Electric Vehicles, Beijing 100081, China. Electronic address: chengsy@bjut.edu.cn. Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China" |
| DOI: | 10.1016/j.jes.2015.09.021 |
| ISSN/ISBN: | 1001-0742 (Print) 1001-0742 (Linking) |
| Abstract: | "A total of 15 light-duty diesel vehicles (LDDVs) were tested with the goal of understanding the emission factors of real-world vehicles by conducting on-board emission measurements. The emission characteristics of hydrocarbons (HC) and nitrogen oxides (NOx) at different speeds, chemical species profiles and ozone formation potential (OFP) of volatile organic compounds (VOCs) emitted from diesel vehicles with different emission standards were analyzed. The results demonstrated that emission reductions of HC and NOx had been achieved as the control technology became more rigorous from Stage I to Stage IV. It was also found that the HC and NOx emissions and percentage of O2 dropped with the increase of speed, while the percentage of CO2 increased. The abundance of alkanes was significantly higher in diesel vehicle emissions, approximately accounting for 41.1%-45.2%, followed by aromatics and alkenes. The most abundant species were propene, ethane, n-decane, n-undecane, and n-dodecane. The maximum incremental reactivity (MIR) method was adopted to evaluate the contributions of individual VOCs to OFP. The results indicated that the largest contributors to O3 production were alkenes and aromatics, which accounted for 87.7%-91.5%. Propene, ethene, 1,2,4-trimethylbenzene, 1-butene, and 1,2,3-trimethylbenzene were the top five VOC species based on their OFP, and accounted for 54.0%-64.8% of the total OFP. The threshold dilution factor was applied to analyze the possibility of VOC stench pollution. The majority of stench components emitted from vehicle exhaust were aromatics, especially p-diethylbenzene, propylbenzene, m-ethyltoluene, and p-ethyltoluene" |
| Keywords: | Air Pollutants/*analysis Alkanes/analysis Alkenes/analysis Benzene Derivatives/analysis China Cities *Environmental Monitoring Hydrocarbons/analysis Nitrogen Oxides/analysis Toluene/analogs & derivatives/analysis Vehicle Emissions/*analysis Volatile Organ; |
| Notes: | "MedlineWang, Gang Cheng, Shuiyuan Lang, Jianlei Li, Song Tian, Liang eng Netherlands 2016/08/16 J Environ Sci (China). 2016 Aug; 46:28-37. doi: 10.1016/j.jes.2015.09.021. Epub 2016 Feb 2" |
