The concentration of the particulate and SO2 dispersed out from the stack around a typical coal based thermal power plant at Delhi, India have been estimated. Annual average meteorological parameters obtained from India Meteorological Department, New Delhi, have been used for calculating the concentration level in different seasons. Stack height variations and atmospheric stability conditions are found to have appreciable effect. Ground level particulate and SO2 concentrations have been calculated by using point source Gaussian plume model. The estimated SO2 concentrations near power plant in down wind directions are found in critical range while those of particulate are within safety limits.