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