en تخصصي Special Original articles <div dir="ltr" style="text-align: justify;"><strong><em><span style="letter-spacing:.2pt;"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Introduction:</span></span></span></em></strong><span style="letter-spacing:.2pt;"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> Today, have been approved scientifically relationship between presence of asbestos fibers in the human respiratory area and malignant diseases such as lung advanced fibrosis (Asbestosis), gastrointestinal, lung and Laryngeal cancers<span dir="RTL">.</span> The aim of this study was the determination of asbestos fibers concentration in Yazd city&rsquo;s air in the summer of 2015.</span></span></span><br> <strong><em><span style="letter-spacing:.2pt;"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Materials and Methods:</span></span></span></em></strong><span style="letter-spacing:.2pt;"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> This is a descriptive cross sectional study in which 13 high-traffic points of Yazd city were selected for asbestos sampling. Sampling was conducted in the summer in two stages using SKC pump. In total were collected 26 samples from the high traffic points of Yazd city. Also for the counting of asbestos fibers was used scanning electron microscopy (SEM).</span></span></span><br> <strong><em><span style="letter-spacing:.2pt;"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Results:</span></span></span></em></strong><span style="letter-spacing:.2pt;"><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> In the current research, the highest and the lowest concentration of asbestos fibers were related to Shohadayemehrab square (0.02131fiber/ml) and Azadshahr (0.00112 fiber/ml) respectively. Qualitative analysis of asbestos fibers by SEM showed that 75% of the samples were asbestos fibers and the other was non-asbestos fibers.</span></span></span><br> <strong><em><span style="letter-spacing:.2pt;"><span style="font-family:times new roman,serif;"><span style="font-size:11.0pt;">Conclusion:</span></span></span></em></strong><span style="letter-spacing:.2pt;"><span style="font-family:times new roman,serif;"><span style="font-size:11.0pt;"> The present study showed that the average of asbestos fibers concentration in total sampling stations (0.00848 fiber/ml) was higher than WHO guidelines (2.2 &times; 10^-3 fiber/ml). The main reason for the presence of these fibers in the air of Yazd city can be attributed to brake pad, clutch and automobile gasket adhesive.</span></span></span></div> Airborne,Asbestos,Scanning Electron, Microscopy,Yazd City. 75 81 http://jehsd.ssu.ac.ir/browse.php?a_code=A-10-1-40&slc_lang=en&sid=1 Mehdi Mokhtari Yes Environmental Science and Technology Research Center, Department of Environmental Health Engineering, School of Public Health, ShahidSadoughi University of Medical Sciences, Yazd, Iran. Negar Jafari No Environmental Research Center, Faculty of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran. Ali Asghar Ebrahimi No Environmental Science and Technology Research Center, Department of Environmental Health Engineering, School of Public Health, ShahidSadoughi University of Medical Sciences, Yazd, Iran. Amir Mohammadi No Environmental Science and Technology Research Center, Department of Environmental Health Engineering, School of Public Health, ShahidSadoughi University of Medical Sciences, Yazd, Iran. Ali Abdolahnejad abdolahnejad.a@gmail.com No Environmental Science and Technology Research Center, Department of Environmental Health Engineering, School of Public Health, ShahidSadoughi University of Medical Sciences, Yazd, Iran. Yaghob Hajizadeh No Environmental Research Center, Department of Environmental Health Engineering, Faculty of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran. Hamideh Niknazar No Department of Occupational Health Engineering, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.