It is clear that the urban environment provides the setting for the life framework of a large and growing proportion of the world's population. In consequence, urban dwellers spend much of their lives in a quite distinctive type of man - modified (polluted) climate. This study focuses on two aspects of urban climatology in the city of Tehran: Climate and Urban Form. Each building reacts with its atmospheric envelope and these micro climatic effects are then integrated into macroclimatic zones which commonly mirror the form of urban development and major land uses. More specifically this research paper intends to test the hypothesis that concentration or dispersion of urban air pollutants depend on atmospheric conditions and heat island in the urban areas, which is affected in turn, by topography and urban form. By some modifications in urban form, therefore, the atmospheric conditions may be changed (wind direction and speed) in an urban area which will eventually lead to better air quality in the city.
Part of the study was based on an experiment in a low speed wind tunnel, which was built for this purpose. Also satellite data was the source of information for preparing the heat islands in Tehran.