The influence of vegetation and street layouts on pollutant dispersion and population exposure in idealized two-dimensional urban street canyon

Indoor air quality in the near-road buildings largely depends on the urban flow patterns and vehicular pollutant dispersion which are greatly affected by urban vegetation configurations and street layouts like building morphologies and aspect ratios (AR, i.e. building height/street width). Trees are usually settled to relieve the burden from urban heat island and maintain urban zoology system, however, trees also tend to reduce urban windiness and further provide adverse impacts on pollutant dilution.