eng Science and Education Publishing American Journal of Modeling and Optimization 2333-1267 2015-04-07 3 2 35 39 10.12691/ajmo-3-2-1 AJMO2015321 article A Mathematical Model for the Study and Forecast of the Concentration of Harmful Substances in the Atmosphere Normakhmad Ravshanov ravshanzade-09@mail.ru 1 Mukhamadamin Shertaev 2 Nodira Toshtemirova 2 Complex Systems Modelling, Tashkent University of Information Technologies, Tashkent, Uzbekistan Medical Biology and Genetics, Tashkent Pediatric Medical Institute, Tashkent, Uzbekistan 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. http://pubs.sciepub.com/ajmo/3/2/1/ajmo-3-2-1.pdf mathematical model numerical algorithm harmful substances wind speed humidity weather and climate factor soil erosion resistance force destruction force concentration