The effects of air pollutants on the agricultural crops have been studied extensively at the recent years. It is important to estimate the crop yield loss due to the effect of air pollution distribution caused by the sources such as factories, refineries and industries on different crops. In this study the dispersion of the pollutants emission from point sources in the atmosphere was modeled based on Gaussian model in MATLAB environment. It is necessary to say that according to the complexity of the phenomenon mentioned, dispersion from sources of pollution and the weather conditions, the necessity of modeling of this process is of great importance. After developing the mathematical model to estimate pollution plume, its performance accuracy was verified using some observational data. To show the application of the proposed model some hypothetical examples were given and the model results were analyzed.