مد لساز ی انتشار و پخش د یاکسید نیتروژن در پایانه مسافربر ی بیهقی تهران.

Modeling the Emission and Spread of Nitrogen Dioxide in Beyhaqi Transportation Terminal.

Aims: The objective of this research is to measure nitrogen dioxide in Beyhaqi Terminal of Tehran and model the release of this pollutant. Methodology: In 3 selected stations, sampling was done once a month during the year and three days a month and 3 times a day. For sampling, NIOSH method No. 6004 and Saltzman method were used with the help of Impinger and Saltzman absorbent solution with a flow rate of 0.2 L/min and then the concentration of this pollutant was determined using a spectrophotometer. Austal view, version 7 software was used for modeling. Findings: In both scenarios regarding the one-hour distribution, the pollutant concentration is high at the beginning, and then due to atmospheric conditions and pollutant chemistry, the pollutant concentration decreases, especially in the western direction, but in 3 directions, south, north, and west, from a maximum distance of 300 meters., the pollutant concentration is greatly reduced. Of course, it decreases much faster from the western side, and the pollution zone continues more towards the east. According to the American National Ambient Air Quality Standard (NAAQS), the allowable amount of this pollutant in a 1-hour average is 100 ppb, no area is in this zone. Also, according to the standard of the World Health Organization, the hourly limit of this pollutant is 200 ppb, and on this basis, there is no limit beyond the standard. Conclusion: By using management and engineering solutions such as reducing the stopping time of cars, not turning on in place and using exhaust absorbent filters, it is possible to reduce pollutant emissions. [ABSTRACT FROM AUTHOR]

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