One of the most complex environmental issues is their pollution. Increasing traffic in cities, MIDC industry, adding large amounts of CO2, SO2 and NO2 to the atmosphere is the main reason for Pune city's growing industry, population, and environmental pollution. We are using AERMOD Software to study the elements present in the atmosphere and the amount of the increased element and the changed geographical position as per the rules of the government of Maharashtra. In the MIDC area of Pune, an air sample was taken using AQI (Air Quality Index) hardware. The information obtained from AQI was entered. Into AERMOD Software to determine additional pollution factors. The information provided by AQI will be used to try to reduce the pollution in that are the simulations showed that the meteorological and topographical conditions of Chakan, favor the dispersal of atmospheric pollutants, that vehicles significantly influence air quality in the region, and that mathematical modeling can be an effective tool for studying atmospheric dispersion in the region