Results demonstrate that there are more advantages than disadvantages of building green roofs to reduce air pollution. Positive environmental impacts emphasize the importance of green roofs as a sustainable option for the construction industry and society. The analysis presented in this paper considered four main polluting substances (NO2, SO2, O3 and PM10); however the production process of polymers releases more toxic substances to different media. Investigations needed to be conducted to enhance the overall air pollution potential of green roofs.