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学科主题: 公共卫生
题名:
On-road emission factor distributions of individual diesel vehicles in and around Beijing, China
作者: Wang, Xing1; Westerdahl, Dane1; Wu, Ye2; Pan, Xiaochuan3; Zhang, K. Max1
关键词: Climate change ; Air quality ; Diesel ; Size distribution
刊名: ATMOSPHERIC ENVIRONMENT
发表日期: 2011
DOI: 10.1016/j.atmosenv.2010.09.014
卷: 45, 期:2, 页:503-513
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Environmental Sciences ; Meteorology & Atmospheric Sciences
研究领域[WOS]: Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
关键词[WOS]: NUCLEATION MODE PARTICLES ; BLACK CARBON ; PARTICULATE MATTER ; REAL-TIME ; SIZE DISTRIBUTIONS ; AEROSOL-PARTICLES ; AETHALOMETER DATA ; MOTOR-VEHICLES ; AIR-POLLUTION ; EXHAUST
英文摘要:

This paper reports findings of a recent field study that characterized the on-road emissions of individual diesel vehicles in and around Beijing, China during November and December of 2009. We successfully sampled 230 individual trucks on 4 major expressways around the city as well as 57 individual buses in the city using refined mobile chasing techniques and fast response instruments. Emission factors (EF) for carbon monoxide (CO), black carbon (BC) and particulate matter with diameters less than 0.5 mu m (PM0.5) are derived from the measurements, which are consistent with the results from laboratory dynamometer tests. The PM0.5 number emission factor distributions demonstrate consistent bimodal modes with peaks around 10 nm and 80 nm, while the mass emission factor distributions demonstrate a unimodal maximum around 110 nm for a majority of the trucks. The BC emissions are shown to be highly correlated with the mass emission of particles with 100-250 nm diameters, which are in good agreement with the results from previous studies. A number of important policy implications are discussed based on the results from this study. First, we identified "heavy emitters" in the on-road fleet we encountered, finding that 5% of diesel trucks in this sample are responsible for 50% of total BC emissions, and 20% of the trucks are responsible for 50% CO and PM0.5 number emissions, 60% PM0.5 mass emissions and over 70% of BC emissions. This suggests that emissions control programs should include identifying and removing heavy emitters from the road or improving their emissions. Second, the BC and PM0.5 number emission factors of trucks registered in regions outside Beijing are significantly higher than those of Beijing-registered trucks, suggesting that improving engine and fuel standards in Beijing alone is not sufficient in reducing the traffic-related air pollution in Beijing. Third, the significantly lower emissions from Euro IV and CNG buses compared to the Euro II and Euro III buses support that introducing clean-burning buses is an effective way to reduce the overall vehicle emissions for the pollutants studied. Fourth, our refined chasing method demonstrates a cost-effective approach to characterize the emissions from a large number of on-road diesel vehicles. Further studies with large sample sizes are critical to constructing more accurate mobile emission inventories to represent the on-road vehicle population. (C) 2010 Elsevier Ltd. All rights reserved.

语种: 英语
所属项目编号: EP-C-06-003
项目资助者: US Environmental Protection Agency (USEPA)
WOS记录号: WOS:000286954800026
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/66410
Appears in Collections:北京大学公共卫生学院_期刊论文

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作者单位: 1.Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14853 USA
2.Tsinghua Univ, Dept Environm Sci & Engn, Beijing 100084, Peoples R China
3.Peking Univ, Sch Publ Hlth, Dept Occupat & Environm Hlth, Beijing 100083, Peoples R China

Recommended Citation:
Wang, Xing,Westerdahl, Dane,Wu, Ye,et al. On-road emission factor distributions of individual diesel vehicles in and around Beijing, China[J]. ATMOSPHERIC ENVIRONMENT,2011,45(2):503-513.
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