Abstarct: Increasing the number of vehicles has led to an increase in demand for class parking cars. This research has been done to determine the share of emissions from exhaust fumes of passenger cars in class parking spaces. The results show that emission exhaust of cars in class parking spaces have the highest share of emissions (CO2), (CO), (NOx) and (HC), respectively. Considering that (CO) is a toxic gas, it is the most important pollutant in parking lots. The largest share of emissions from exhaust emissions from passenger cars during ramps is due to contamination(NOX). Also, the total emission of exhaust pollutants from the car's exhaust floor on the ground floor parking class, the acceleration process is further performed, for carbon monoxide(CO), carbon dioxide (CO2), nitrogen oxides (NOx) ) And hydrocarbons (HC) are 6, 4, 6 and 30 percent higher. Meanwhile, by comparing the coefficients of class carriage propagation and the main arterial pathway in Mosshad-Iran, it was found that the rate of propagation in class parking with an average velocity of 10.76 km/h was greater than the original arterial pathway with an average speed of 20.27 km/h for (CO) contaminants, Carbon dioxide (CO2), and hydrocarbons (HC) increased 125, 19 and 125 percent. But for nitrous oxide contaminants (NOx), this rate has been down by 39 percent. Therefore, it can be concluded that (NOx) emissions are higher. The higher the average speed of the vehicle and the more longitudinal length, the higher the (NOx) emission rate due to the increase in engine temperature and the increase in pressure, the increase in nitrogen oxide emissions (NOx) Find out.