Abstract: The atmospheric process in this article and air quality simulating in coast are discussed. Considering the vertical wind shear, a transport and diffusion model for sea and land breeze is derived. It is assumed that dispersion of pollutants in the upper layer and in the lower layer proceed independently in view of the different wind direction of each layer. The results of case study show that the model is available for air quality predicting in shore line.Key Words Sea and land breeze; Vertical shear of wind: Atmospheric transport and diffusion model.