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A detailed and comprehensive numerical study of wind induced pollutant dispersion around buildings has been carried out. The previous numerical studies on pollutant dispersion around rectangular buildings were only investigated for limited situations. This paper constructs an actual buildings in a district characterized by Boiler Room for heating, and then computes the concentration profiles by simulating the flow field coupling the dispersion field around buildings. The numerical simulation results are compared with those from the Gaussian Model and from the experiments. The results of numerical simulation generally agree well with the experiments reported in the literature. It is also found that the numerical simulation predicts ground level pollutant concentrations better than the Gaussian Model in the near building wake. The numerical concentration is suitable for environmental impact evaluation and for warning residents to select outdoor sports or indoor sports.