Field investigation of roadside vegetative and structural barrier impact on near-road ultrafine particle concentrations under a variety of wind conditions

Gayle S.W. Hagler, Ming-Yeng Lin, Andrey Khlystov, Richard W. Baldauf, Vlad Isakov, James Faircloth, Laura E. Jackson

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

Roadside barriers, such as tree stands or noise barriers, are prevalent in many populated areas and have been shown to affect the dispersion of traffic emissions. If roadside noise barriers or tree stands are found to consistently lower ground-level air pollution concentrations in the near-road environment, this may be a practical strategy for reducing exposures to air contaminants along populated traffic corridors. This study measured ultrafine particle (UFP) concentrations using an instrumented mobile measurement approach, collecting data on major roadways and in near-road locations for more than forty sampling sessions at three locations in central North Carolina, USA. Two of the sampling sites had relatively thin tree stands, one evergreen and one deciduous, along a portion of the roadway. The third sampling site had a brick noise wall along a portion of the road. At 10. m from the road, UFPs measured using a mobile sampling platform were lower by approximately 50% behind the brick noise wall relative to a nearby location without a barrier for multiple meteorological conditions. The UFP trends at the vegetative barrier sites were variable and the barrier effect is uncertain. In some cases, higher concentrations were observed behind the vegetative barrier, with respect to the clearing, which may be due to gaps in the thin tree stands allowing the transport of traffic-related air pollution to near-road areas behind the vegetation. On-road sampling revealed no consistent difference in UFP levels in on-road portions of the road with or without a roadside barrier present. These findings support the notion that solid roadside barriers may mitigate near-road impact. Given the co-benefits of vegetative barriers in the urban landscape, research regarding the mitigation potential of vegetative barriers of other configurations (e.g., greater density, wider buffer) is encouraged.

Original languageEnglish
Pages (from-to)7-15
Number of pages9
JournalScience of the Total Environment
Volume419
DOIs
Publication statusPublished - 2012 Mar 1

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Roadsides
Sampling
road
Brick
Air pollution
sampling
atmospheric pollution
Buffers
Ultrafine
particle
Impurities
traffic emission
Air
mitigation
pollutant
vegetation
air

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Cite this

Hagler, Gayle S.W. ; Lin, Ming-Yeng ; Khlystov, Andrey ; Baldauf, Richard W. ; Isakov, Vlad ; Faircloth, James ; Jackson, Laura E. / Field investigation of roadside vegetative and structural barrier impact on near-road ultrafine particle concentrations under a variety of wind conditions. In: Science of the Total Environment. 2012 ; Vol. 419. pp. 7-15.
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Field investigation of roadside vegetative and structural barrier impact on near-road ultrafine particle concentrations under a variety of wind conditions. / Hagler, Gayle S.W.; Lin, Ming-Yeng; Khlystov, Andrey; Baldauf, Richard W.; Isakov, Vlad; Faircloth, James; Jackson, Laura E.

In: Science of the Total Environment, Vol. 419, 01.03.2012, p. 7-15.

Research output: Contribution to journalArticle

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