Investigating the Effects of Traffic Volume on Types of Air Traffic Flows on Urban Quality (Case Study: Tehran)

The problem of air pollution and the deterioration of air quality in metropolitan cities is one of the most critical environmental issues in today's societies, which has caused serious risks to the health of humans and the surrounding environment. The flow of traffic in urban areas, which includes several fleets, has a significant contribution to the production of air pollutants in the city. The proper management of the various traffic fleets in the inter-city transit network can have a significant effect on the faster improvement of urban air quality during the air pollution crisis. In this study, a study was carried out on the analysis and modeling of the effect of traffic volume and traffic flow variation on the urban air pollution and pollutant concentrations near the air quality control station of the 11th district of Tehran. Hourly surveys were carried out under unheated weather conditions without atmospheric instability (including atmospheric precipitation, dust and drought phenomena, etc.). The results showed that, on average, when passing traffic equal to that of the various fleets in the study, passenger diesel vehicles compared to two diesel engine fleets and personal gasoline vehicles increased the impact of pollutants production PM2.5 and SO2. However, in the case of average traffic flow, the traffic flow volumes from the target range, on average, have a greater impact on the production of PM2.5 and SO2 pollutants than other fleets of the fleet.