DOI: 10.1016/j.atmosenv.2014.08.037
Scopus记录号: 2-s2.0-84906239082
论文题名: A review of fundamental drivers governing the emissions, dispersion and exposure to vehicle-emitted nanoparticles at signalised traffic intersections
作者: Goel A ; , Kumar P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 97 起始页码: 316
结束页码: 331
语种: 英语
英文关键词: Airborne nanoparticles
; Exposure assessment
; Number size distribution
; Particle dynamic
; Traffic intersections
Scopus关键词: Deposition
; Dispersions
; Roadsides
; Traffic control
; Deposition
; Dispersions
; Pollution control
; Roadsides
; Traffic control
; Airborne nanoparticles
; Exposure assessment
; Number size distribution
; Particle dynamics
; Traffic intersections
; Nanoparticles
; Nanoparticles
; nanoparticle
; unclassified drug
; vehicle emitted nanoparticle
; carbon emission
; dispersion
; flow modeling
; nucleation
; particle motion
; pollution monitoring
; traffic emission
; urban area
; atmospheric pollution
; emission inventory
; pollution exposure
; roadside environment
; urban atmosphere
; urban pollution
; air pollution
; conceptual framework
; dispersion
; exhaust gas
; exposure
; knowledge
; model
; priority journal
; review
; traffic
; urban area
; wind
; acceleration
; driver
; driving ability
; environmental exposure
; human
; motor vehicle
; Review
; velocity
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: Signalised traffic intersections (TIs) are considered as pollution hot-spots in urban areas, but the knowledge of fundamental drivers governing emission, dispersion and exposure to vehicle-emitted nanoparticles (represented by particle number concentration, PNC) at TIs is yet to be established. A number of following key factors, which are important for developing an emission and exposure framework for nanoparticles at TIs, are critically evaluated as a part of this review article. In particular, (i) how do traffic- and wind-flow features affect emission and dispersion of nanoparticles? (ii) What levels of PNCs can be typically expected under diverse signal- and traffic-conditions? (iii) How does the traffic driving condition affect the particle number (PN) emissions and the particle number emission factors (PNEF)? (iv) What is the relative importance of particle transformation processes in affecting the PNCs? (v) What are important considerations for the dispersion modelling of nanoparticles? (vi) What is extent of exposure at TIs with respect to other locations in urban settings? (vii) What are the gaps in current knowledge on this topic where the future research should focus? We found that the accurate consideration of dynamic traffic flow features at TIs is essential for reliable estimates of PN emissions. Wind flow features at TIs are generally complex to generalise. Only a few field studies have monitored PNCs at TIs until now, reporting over an order of magnitude larger peak PNCs (0.7-5.4×105cm-3) compared with average PNCs at typical roadsides (~0.3×105cm-3). The PN emission and thus the PNEFs can be up to an order of magnitude higher during acceleration compared with steady speed conditions. The time scale analysis suggests nucleation as the fastest transformation process, followed by dilution, deposition, coagulation and condensation. Consideration of appropriate flow features, PNEFs and transformation processes emerged as important parameters for reliable modelling of PNCs at TIs. Computation of respiratory deposition doses (RDD) based on the available PNC data suggest that the peak RDD at TIs can be up to 12-times higher compared with average RDD at urban roadsides. Systematic field and modelling studies are needed to develop a sound understanding of the emissions, dispersion and exposure of nanoparticles at the TIs. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80911
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, Faculty of Engineering and Physical Sciences (FEPS), University of Surrey, Guildford GU2 7XH, United Kingdom; Environmental Flow (EnFlo) Research Centre, FEPS, University of Surrey, Guildford GU2 7XH, United Kingdom
Recommended Citation:
Goel A,, Kumar P. A review of fundamental drivers governing the emissions, dispersion and exposure to vehicle-emitted nanoparticles at signalised traffic intersections[J]. Atmospheric Environment,2014-01-01,97