Science and Education Publishing American Journal of Modeling and Optimization 2333-1267 3 2 2015 04 07 A Mathematical Model for the Study and Forecast of the Concentration of Harmful Substances in the Atmosphere 35 39 EN Normakhmad Ravshanov Complex Systems Modelling, Tashkent University of Information Technologies, Tashkent, Uzbekistan Mukhamadamin Shertaev Nodira Toshtemirova AJMO2015321 10.12691/ajmo-3-2-1 2015 03 14 2015 04 02 2015 04 07 This article contains a brief overview of the problem of studying and forecasting the diffusion of harmful substances in the atmosphere. Authors developed a mathematical model that takes into several parameters of the process and also weather and climate factors. Numerical experiments were conducted based on the given model. The obtained results presented here show the main factors, such as wind speed, soil moisture, soil composition significantly affect the diffusion of harmful substances in the atmosphere.