![]() Understanding the problem from the urban and city scale is therefore paramount.Įmissions from motor vehicles contribute to air pollution in urban areas, particularly at street canyon levels. The risk of air pollution is relatively low to individual health but is considerably higher to public health. People living in high-density cities suffer from both short and long term exposure to ambient air pollution. A real urban case study is finally conducted to demonstrate that the suggested design principles from the parametric study are feasible in the practical high density urban design. Given the finite land resources in high-density cities and the numerous planning and design restrictions for development projects, the effectiveness of mitigation strategies is evaluated to optimize the benefits. Urban-scale parametric studies are conducted to clarify the effects of urban permeability and building geometries on air pollution dispersion, for both the outdoor pedestrian environment and the indoor environment in the roadside buildings. The SST κ– ω model is adopted after balancing the accuracy and computational cost in the comparative study. The methods in this study are CFD simulation and parametric study. The air ventilation assessment for projects in high-density Hong Kong is advanced to include air pollutant dispersion issues. This study addresses the knowledge-gap between planning and design principles and air pollution dispersion potentials in high density cities. High-density urban morphologies need to be carefully designed to lessen the ill effects of high density urban living. The coupled result leads to frequent reports of high air pollution indexes at street-side stations in Hong Kong. ![]() Apart from higher pollution emissions due to human activities in densely populated street canyons, stagnated air flow due to closely packed tall buildings means lower dispersion potential. ![]() In high-density megacities, air pollution has a higher impact on public health than cities of lower population density. ![]()
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