Abstract: The study examined three intersection configurations(three-way, four-way, and roundabout) at three aspect ratios(1,1.25, and 1.5). The study indicated that the ventilation efficiency of streets was weakest at three-way intersections and was further reduced by increasing the aspect ratio within the street. Vortices formed between buildings resulted in higher wind velocities in the center of the intersection, lower wind speeds within the roadway, and increased pollutant deposition.