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Studying the mechanism of pollutant transport around an isolated building is essential to address the environmental issue of air pollution around buildings and to understand the intricate process of pollutant dispersion in urban environments. In this paper, an effective numerical approach is used to study the effects of building heights and widths on airflow and pollutant dispersion around an isolated building. The source of pollutants is behind the building. The pollutant is confined to the lower areas as a result of small vortices behind the low-rise buildings, and transported to the wake area. Whereas high-rise buildings make the pollutant move to an upper region. At the pedestrian level, the wake area of the lower building stores more pollution. Therefore, the environment around the low-rise buildings may be more hazardous. The concentration of pollutants is greater at higher altitudes around wider buildings. Pollutants are transferred to the sides of wider buildings at the pedestrian level, leading to lower concentrations in the wake-central area. A wider building poses a greater lateral dangerous-area, while a narrower building results in a longer central wake area that is hazardous. [ABSTRACT FROM AUTHOR]