DOI: 10.1016/j.atmosenv.2015.10.016
Scopus记录号: 2-s2.0-84945128354
论文题名: Trends in selected ambient volatile organic compound (VOC) concentrations and a comparison to mobile source emission trends in California's South Coast Air Basin
作者: Pang Y ; , Fuentes M ; , Rieger P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 122 起始页码: 686
结束页码: 695
语种: 英语
英文关键词: Ambient
; Emission
; Light-duty gasoline vehicles
; Source contributions
; VOC
Scopus关键词: Crashworthiness
; Dynamometers
; Emission control
; Mobile power plants
; Neutron emission
; Organic compounds
; Vehicles
; Volatile organic compounds
; 2 ,2 ,4-trimethylpentane
; Ambient
; Ambient concentrations
; Light duty gasoline vehicles
; Mobile source emissions
; Photochemical assessment monitoring stations
; Source contributions
; Volatile organic compound (VOC)
; Gasoline
; 2,2,4 trimethylpentane
; acetylene
; benzene
; ethane
; gasoline
; isoprene
; pentane
; propane
; unclassified drug
; volatile organic compound
; ambient air
; annual variation
; benzene
; concentration (composition)
; emission control
; pollutant source
; traffic emission
; trend analysis
; volatile organic compound
; Article
; controlled study
; dynamometer
; exhaust gas
; high temperature
; low temperature
; motor vehicle
; priority journal
; United States
; California
; South Coast Air Basin
; United States
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Trends in ambient concentrations of Volatile Organic Compounds (VOC) in the South Coast Air Basin (SoCAB) are compared to trends in VOC emissions from Light-Duty Gasoline Vehicles (LDGV) tested on chassis dynamometers and to trends observed in tunnel studies during the same period to understand the impacts of gasoline vehicle emissions on ambient VOC concentrations from 1999 to 2009. Annual median concentrations for most ambient VOCs decreased 40% from 1999 to 2009 in the SoCAB, based on data from the Photochemical Assessment Monitoring Stations (PAMS). Annual concentration decreases of most compounds, except 2,2,4-trimethylpentane, are highly correlated with the decrease of acetylene, a marker for tailpipe emissions from LDGV. This indicates that ambient VOC concentration decreases were likely due to tailpipe emission reductions from gasoline vehicles. Air Toxics Monitoring Network data also support this conclusion. Benzene concentration-normalized ratios for most compounds except ethane, propane, isoprene, and 2,2,4-trimethylpentane were stable even as these compound concentrations decreased significantly from 1999 to 2009. Such stability suggests that the main sources of ambient VOC were still the same from 1999 to 2009. The comparison of trends in dynamometer testing and tunnel studies also shows that tailpipe emissions remained the dominant source of tunnel LDGV emissions. The pronounced changes in 2,2,4-trimethylpentane ratios due to the introduction of Phase 3 gasoline also confirm the substantial impact of LDGV emissions on ambient VOCs. Diurnal ambient VOC data also suggest that LDGV tailpipe emissions remained the dominant source of ambient VOCs in the SoCAB in 2009. Our conclusion, which is that current inventory models underestimate VOC emissions from mobile sources, is consistent with that of several recent studies of ambient trends in the SoCAB. Our study showed that tailpipe emissions remained a bigger contributor to ambient VOCs than evaporative emissions from LDGV's. This finding is also different from EMFAC estimates. © 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81402
Appears in Collections: 气候变化事实与影响
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作者单位: California Air Resources Board, 9528 Telstar Ave, El Monte, CA, United States
Recommended Citation:
Pang Y,, Fuentes M,, Rieger P. Trends in selected ambient volatile organic compound (VOC) concentrations and a comparison to mobile source emission trends in California's South Coast Air Basin[J]. Atmospheric Environment,2015-01-01,122