<p>Atmospheric conditions are one of the effective factors on transport and its safety. One of the undesirable weather phenomena that have effect on various aspects of human life is dust. The western provinces, particularly Khuzestan has faced with dust phenomenon in recent years. In this study, using the information in relation to dust and traffic and using a statistical analysis how the impact of changes of dust on the traffic intensity and the average speed of vehicles in the axes of the province have been studied. And this effect was displayed as quantitative relationship.</p>