Simulation of the dispersion of atmospheric pollutants is the study of the path of atmospheric pollutants from the moment they are emitted from a source until they end up at a receiver. Mathematical simulation (modeling) of pollutant dispersion is an essential part of air pollution studies. It is required by law in many environmental problems but it is also the way to control air pollution. In the lectures, the main points of the simulations of the dispersion of atmospheric pollutants will be developed, theoretically and with examples.