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Environ Pollut. 2017 Dec;231(Pt 1):768-778. doi: 10.1016/j.envpol.2017.08.081. Epub 2017 Aug 30.

Air quality considerations for stormwater green street design.

Author information

1
Department of Biological and Agricultural Engineering, North Carolina State University, Box 7625, Raleigh, NC 27695, United States. Electronic address: kmconroy@ncsu.edu.
2
Hazen and Sawyer, One South Broad Street, Suite 1630, Philadelphia, PA 19107, United States.
3
Global Centre for Clean Air Research (GCARE), Department of Civil and Environmental Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom.
4
Department of Biological and Agricultural Engineering, North Carolina State University, Box 7625, Raleigh, NC 27695, United States.

Abstract

Green streets are increasingly being used as a stormwater management strategy to mitigate stormwater runoff at its source while providing other environmental and societal benefits, including connecting pedestrians to the street. Simultaneously, human exposure to particulate matter from urban transportation is of major concern worldwide due to the proximity of pedestrians, drivers, and cyclists to the emission sources. Vegetation used for stormwater treatment can help designers limit the exposure of people to air pollutants. This goal can be achieved through the deliberate placement of green streets, along with strategic planting schemes that maximize pollutant dispersion. This communication presents general design considerations for green streets that combine stormwater management and air quality goals. There is currently limited guidance on designing green streets for air quality considerations; this is the first communication to offer suggestions and advice for the design of green stormwater streets in regards to their effects on air quality. Street characteristics including (1) the width to height ratio of the street to the buildings, (2) the type of trees and their location, and (3) any prevailing winds can have an impact on pollutant concentrations within the street and along sidewalks. Vegetation within stormwater control measures has the ability to reduce particulate matter concentrations; however, it must be carefully selected and placed within the green street to promote the dispersion of air flow.

KEYWORDS:

Air quality; Green streets; Particulate matter; Stormwater; Street trees

PMID:
28865382
DOI:
10.1016/j.envpol.2017.08.081
[Indexed for MEDLINE]

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