Abstract: A diffusion model of shoreline fumigation is developed, which needn’t make the assumption of the constant eddy diffusivity or the “area source”. The model of Thermal Internal Boundary layer (TIBL) height is simplified according to the two-dimensional theory and the observational data in existence. The results of the analysis and prediction show that the pollutant source is averted to set near the place where the effective source height (He) is equal to the TIBL height. A tall stack should be set far away from the shoreline or near the shoreline.