Abstract
Traffic–related pollutant has been recognized as an air pollution hot spot due to its large emission rate and great health impacts for the exposed population. In the present investigation, a computational fluid dynamics technique is used to investigate the effect of street layout on pollutant dispersion and find proper location for air inlet in ventilation systems. Four typical configurations of asymmetric street canyons are considered. It is found that pollutant retention time at people stayed zones is shorter, when buildings near the road are laid as down-wind building lower than the up-wind building. For buildings at down-wind side of a main road, air inlet should be located at the leeward façade of the building.
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