Iranian Research Organization for Science and Technology Advances in Environmental Technology 2476-6674 12 1 2026 01 01 Dispersion modeling of SO2, NO2, and CO emitted from the Sahand thermal power plant using AERMOD software 89 102 1642 10.22104/aet.2026.7387.2052 EN Mahdi Saghafi Department of Mechanical Engineering, Faculty of Engineering, University of Bonab, Bonab, Iran Ali Hajiabdollahi Mamaghani Department of Mechanical Engineering, Faculty of Engineering, University of Bonab, Bonab, Iran Journal Article 2025 02 02 In this research, the dispersion of gaseous pollutants emitted from the Sahand thermal power plant was simulated using AERMOD software to determine the concentrations of sulfur dioxide, nitrogen dioxide, and carbon monoxide in the surrounding area. AERMOD was used to analyze the concentration patterns of these pollutants within a 35.9 km2 domain, covering the cities of Bonab, Ajabshir, and Khoshehmehr, along with their nearby villages. For this purpose, two years of meteorological data, along with geographical information and emission source characteristics, were utilized to estimate pollutant concentrations over averaging periods of 1 hour, 3 hours, 24 hours, and annual averages. Comparison of the modeled results with the limits defined in the environmental standards indicates that the maximum concentrations of nitrogen oxide and carbon monoxide in residential areas are within the permissible limits. However, the highest concentration of sulfur dioxide exceeds the limits in some villages, suggesting a potential health risk for residents. https://aet.irost.ir/article_1642_81c650caac28cdefce4de5ddc18befa0.pdf