DOI: 10.1016/j.atmosenv.2014.05.074
Scopus记录号: 2-s2.0-84902676394
论文题名: Roadside levels and traffic emission rates of PM2.5 and BTEX in Ho Chi Minh City, Vietnam
作者: Huong Giang N ; T ; , Kim Oanh N ; T
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 94 起始页码: 806
结束页码: 816
语种: 英语
英文关键词: BTEX
; Emission factor
; Fleet emission rate
; Ho Chi Minh City
; Inverse modeling
Scopus关键词: Inverse problems
; Particulate emissions
; Principal component analysis
; BTEX
; Calculation algorithms
; Emission factors
; Fleet emissions
; Inverse modeling
; Monitoring programs
; Traffic compositions
; Vehicle emission factors
; Roadsides
; benzene
; ethylbenzene
; toluene
; xylene
; air sampling
; algorithm
; chemical composition
; optimization
; particulate matter
; pollution monitoring
; principal component analysis
; roadside environment
; traffic emission
; urban pollution
; adsorption
; air pollutant
; air sampling
; algorithm
; article
; concentration (parameters)
; meteorology
; particulate matter
; pollution monitoring
; priority journal
; traffic
; Viet Nam
; Ho Chi Minh City
; Viet Nam
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: A monitoring program was designed and implemented to characterize roadside levels of PM2.5 and BTEX in Ho Chi Minh City, Vietnam, and to generate input data for CALINE (California LINE Source Dispersion Model) inverse modeling. Monitoring was done during Dec 2007-Jan 2008, on both weekdays and weekends, and yielded 284 hourly BTEX samples (adsorption tubes), 24 samples of 8h-PM2.5 and 42 samples of 24h-PM2.5 (by MiniVol samplers). The air sampling was done at 8 points on both sides of one street that had an average traffic flow, simultaneously meteorology data and vehicle flows were recorded. Roadside 24h-PM2.5 levels were 97±31 (53-151) μgm-3, higher on weekdays than weekends. Diurnal BTEX variation patterns were consistent with the diurnal flows of 6 vehicle categories moving on the street. BTEX levels were reduced with the increase in downwind distance from traffic lanes (approximately by 15% for each 5m increment). Principal component analysis also confirmed the association between roadside pollution levels and traffic. A calculation algorithm was developed to remove the urban background, contributed by other sources than traffic in the selected street, from the roadside measured pollution levels. Urban background contributed a majority of PM2.5 (90-98%) and hourly BTEX (67-97%) with higher contributions at upwind side of the street and at late evening hours when less traffic was observed. CALINE inverse modeling produced explainable fleet hourly emission rates (gkm-1h-1) and vehicle emission factors (EF, mgveh-1km-1). The obtained EF for gasoline and diesel vehicles were comparable with recent measurements made in Asian cities, as well as with calculated EFs for European and US urban fleets about 10-15 years ago. To minimize the collinearity problem encountered in inverse traffic modeling it is essential that the monitoring is done at different times to capture significant variations in the street traffic compositions. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81037
Appears in Collections: 气候变化事实与影响
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作者单位: Environmental Engineering and Management, Asian Institute of Technology, Pathumthani 12120, Thailand; Department of Environmental Science, University of Da Lat, DaLat City, Viet Nam
Recommended Citation:
Huong Giang N,T,, Kim Oanh N,et al. Roadside levels and traffic emission rates of PM2.5 and BTEX in Ho Chi Minh City, Vietnam[J]. Atmospheric Environment,2014-01-01,94