Abstract
Wind tunnel is one of the good tool for the research of mechanism, simulation ofairflow and pollutant diffusion in the atmosphere. Particulary, for the simulation of airflow around buildings or topography, wind tunnel is the most reliable tool . In this paper present state of the wind tunnel simulation of airflow and diffusion is discussed with several simulation studies of airflow and diffusion in adiabatic boundary layer, in a street canyon, diffusion from a source on a building roof and airflow over an isolated mountain
