en تخصصي Special Original articles <p dir="ltr" style="line-height: 115%; text-align: justify;"><strong><em><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Introduction:</span></span></em></strong> <span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Due to more than 1.7 million population, many vehicles and large industries around Isfahan, it has become one of the most polluted cities in Iran. The aim of this study was a spatial analysis of the concentrations of air pollutants and the air quality index (AQI).</span></span><br> <strong><em><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Materials and Methods:</span></span></em></strong><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> In this descriptive and evaluative study, the air quality data of 7 monitoring stations in 2012 were taken from the Isfahan Department of Environment. The calculation of AQI was done as per the EPA guidelines. The zoning pollutant concentrations and AQI in the study area was determined with the use of the Arc map software, version 10.1.</span></span><br> <strong><em><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Results:</span></span></em></strong><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> The results showed that the highest concentrations of pollutants and the AQI were related to the Ahmadabad station. Moreover, the air quality in Isfahan in 2012 was 4.38% (4 days) in good conditions, 12.7% (47 days) in moderate conditions, 42.56% (156 days) in unhealthy conditions for sensitive groups, 39.49% (144 day) in unhealthy conditions, 2.8% (10 days) in a very unhealthy and 1.2% (4 days) in dangerous conditions, respectively.</span></span><br> <strong><em><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Conclusion<span dir="RTL">:</span></span></span></em></strong><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> It was found that particulate matter was the main cause of Isfahan air pollution while Ahmadabad is the most polluted point in Isfahan. According to the calculations, during 314 days of the year 2012, the air quality of Isfahan was in unhealthy conditions and only 4 days was in good conditions. This is one of the biggest health challenges in this city.</span></span></p> AQI,Monitoring Stations,Isfahan,Geographic Information Systems 263 272 http://jehsd.ssu.ac.ir/browse.php?a_code=A-10-1-33&slc_lang=en&sid=1 Negar Jafari No Department of Environmental Health Engineering and Environmental Research Center, Isfahan University of Medical Sciences, Isfahan. Iran. Ali Asghar Ebrahimi No Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Amir Mohammadi No Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Yaghob Hajizadeh No Department of Environmental Health Engineering and Environmental Research Center, Isfahan University of Medical Sciences, Isfahan. Iran. Ali Abdolahnejad abdolahnejad.a@gmail.com Yes Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.