DOI: 10.1016/j.atmosenv.2014.03.040
Scopus记录号: 2-s2.0-84897409225
论文题名: The influence of roadside vegetation barriers on airborne nanoparticles and pedestrians exposure under varying wind conditions
作者: Al-Dabbous A ; N ; , Kumar P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 90 起始页码: 113
结束页码: 124
语种: 英语
英文关键词: Nanoparticles
; Particle number concentration
; Particle size distribution
; Respiratory deposited doses
; Roadside vegetation barrier
; Traffic emissions
Scopus关键词: Nanoparticles
; Noise pollution
; Particle size analysis
; Roadsides
; Wind
; Airborne nanoparticles
; Deposited dose
; Differential mobility spectrometers
; Geometric mean diameters
; Particle number concentration
; Roadside vegetation
; Size-resolved particles
; Traffic emissions
; Vegetation
; nanoparticle
; data set
; geometry
; particle motion
; particle size
; pollution exposure
; roadside environment
; site investigation
; urban area
; vegetation cover
; wind direction
; airborne particle
; article
; environmental temperature
; exhaust gas
; highway
; human
; inhalation
; particle size
; pedestrian
; priority journal
; respiratory system
; spectrometer
; vegetation
; wind
; England
; Guildford
; Surrey [England]
; United Kingdom
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: Roadside vegetation barriers are used in many urban areas to restrict air and noise pollution from reaching roadside pedestrians, but their effectiveness in limiting the movement of nanoparticles is not yet known. This study investigates the influence of a roadside vegetation barrier on particle number distribution (PND) and concentration (PNC) and associated exposure under different wind directions. Size-resolved particles in the 5-560nm size range were measured along a busy roadside in Guildford (Surrey, UK) using a fast response differential mobility spectrometer (DMS50). A custom-built solenoid switching system, together with the DMS50, was used to make sequential measurements at the front (L2), middle (L3) and back (L4) of the vegetation barrier; L1 was in parallel to L2 at a vegetation-free location. Measured data were divided into the three predominant wind directions: cross-road (NW-SW), cross-footpath (NE-SE) and along-road (NW-NE). The consistency in the shape of PNDs and the corresponding geometric mean diameters at the three sites (L2, L3, L4) indicate an identical removal effect of vegetation barrier for all sizes of particles. Comparison of the PNCs at two parallel locations (with and without the vegetation barrier) showed ~11% higher PNCs (1.99±1.77×105cm-3) at L2 than those at L1 during cross-road winds, showing the impeding effect of the vegetation barrier. Such differences were insignificant during the remaining wind directions. Cross-road winds indicate the effect of vegetation barrier; the PNCs were decreased by 14 and 37% at L3 and L4, respectively, compared with L2. During cross-footpath winds, particles were carried away by the wind from the sampling location. Significant decrease in PNCs were consequently seen at L3 (1.80±1.01×104cm-3) and L4 (1.49±0.91×104cm-3) compared with L2 (6.26±3.31×104cm-3). The PNCs at these locations showed modest differences during the cross-footpath and along-road winds. Respiratory deposited doses (RDD) at L4 were found to be the lowest during all wind directions compared with the L1-L3. The vegetation barrier efficiently reduced the RDD by ~36% during cross-road winds. Our results show the mitigation potential of vegetation barriers in limiting near-road nanoparticles exposure and the measured data can facilitate performance evaluation of theoretical models. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80823
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:
Al-Dabbous A,N,, Kumar P. The influence of roadside vegetation barriers on airborne nanoparticles and pedestrians exposure under varying wind conditions[J]. Atmospheric Environment,2014-01-01,90