Modeling the emission and spread of air pollutants in Beyhaqi passenger terminal of Tehran under different scenarios

The purpose of this research is to measure air pollutants (especially PM10) in Beyhaqi Terminal of Tehran and to model the release of this pollutant under various conditions.

In order to measure the pollutant of suspended particles with a diameter of 10 microns (PM10), a portable device model Grimm 108/109 was used. In the selected points, sampling was done once a month during the year, three days a month and 3 times a day, and the sampling was done at different times of the day, i.e. morning, noon and evening, according to the increase and decrease of vehicle traffic. And for the purpose of modeling, Austal view, version 7 software was used.

The results showed that the concentration measured in the autumn and winter seasons was higher than the first six months of the year. Since in the standard of the World Health Organization, the daily limit for this pollutant is 50 micrograms per cubic meter, it can be seen that in the first scenario, in some areas (distances less than 300 meters from the source), the concentration of the pollutant exceeded the standard. The rest of the ranges are within the standard range. In the second scenario and based on the emission reduction factor of 70%, it was determined that all areas are within the standard range.

Finally, reducing the stopping time of cars, not turning on lights and using exhaust absorbent filters will help to reduce the emission of suspended particles.