en Occupational and Industrial Health Occupational and Industrial Health پژوهشي Original Article <p dir="ltr"><span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Background: </strong>Noise mapping in industry can be useful to assess the risks of harmful noise, or to monitor noise in machine rooms. Using GIS -based software for plot of noise maps in an indoor noisy work environment can be helpful for occupational hygienists to monitor noise pollution.<br> <strong>Methods: </strong>This study was carried out in noisy packaging unit of a food industry in Ghazvin industrial zone, to evaluate noise levels by GIS technique. For this reason the floor of packaging unit was divided into squares 2&times;2 meters and the center of each square was marked as a measurement station based on NIOSH method. The sound pressure level in each station was measured and then the measurement values were imported into Arc GIS software to plot of noise map.</span></span><br> <span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Results: </strong>Unlike current method, the noise maps generated by GIS technique are consistent with the nature of sound propagation.</span></span><br> <span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Conclusion: </strong>This study showed that for an indoor work environment, the application of GIS technology renders the assessment of noise levels in the form of noise maps, is more real and more accurate than the routine method that is now using by the occupational hygienists.</span></span></p> Noise map, GIS -based software, Indoor, Work environment . 138 142 http://jhehp.zums.ac.ir/browse.php?a_code=A-10-31-2&slc_lang=en&sid=1 Faramarz Majidi fma@zums.ac.ir 10031947532846009249 10031947532846009249 No Department of Occupational Hygiene Engineering, Zanjan University of Medical Sciences, Zanjan, Iran. Nahid Rezai nahid@yahoo.com 10031947532846009250 10031947532846009250 Yes Department of Occupational Hygiene Engineering, Zanjan University of Medical Sciences, Zanjan, Iran.