Using Computational Fluid Dynamics (CFD) technique, the dispersion contours and the exposure rate of Flexographic printing workers to VOCs in a printing department is evaluated. Firstly, VOCs distribution is determined in the printing room due to the existing ventilation system. Through next steps, 4 scenarios for lowering VOCs concentration and its exposure rate to workers are analyzed. Concentration distributions of ethylene glycol (MEG) as a representative of VOCs are determined for 4 scenarios. The results show that, regarding the existing ventilation, the concentration of MEG at the breathing height is 1×10-5 mg/m3 and it is higher than the standard permissible level. Finally, the findings of this study lead to lowered VOCs concentrations to 13.87×10-9 mg/m3 via changing the ventilation system for the Flexography Printing Room.
 Hadad, K., Doulatdar, R., and Mehdizadeh, S., “Indoor radon monitoring in Northern Iran using passive and active measurements”, Journal of environmental radioactivity, 95, 1, pp. 39-52, 2007.
 Hadad, K., Hakimdavoud, M.R., and Hashemi-Tilehnoee, M., “Indoor radon survey in Shiraz-Iran using developed passive measurement method”, Iran J. Radiat. Res., 9, 3, pp. 175-182, 2011.
 Hadad, K., and Mokhtari, J., “Indoor radon variations in central Iran and its geostatistical map”, Atmospheric Environment, 102, pp. 220-227, 2015.
 Hadad, K., and Doulatdar, R., “U-series concentration in surface and ground water resources of Ardabil province”, Radiation Protection Dosimetry, 130, 3, pp. 309-318, 2008.
 Hadad, K., Sarshough, S., Faghihi, R., and Taheri, M., “Application of polystyrene films for indoor radon dosimetry as SSNTD”, Applied Radiation and Isotopes, 74, pp. 23-25, 2013.
 Mehdizadeh, S., Owji, H., and Hadad, K., “Radon concentration variation in Shiraz air and its variable”, 3 International Conference on Nuclear Science and Technology in Iran, Iran, 2006.
 Nejadkoorki, F., Nicholson, K., and Hadad, K., “The design of long-term air quality monitoring networks in urban areas using a spatiotemporal approach”, Environmental Monitoring and Assessment, 172, 1, pp. 215-223, 2011.
 Fowler, C. S., Williamson, A. D., Pyle, B. E., McDonough Susan, E., and Menetrez, M. Y., “Large Building Radon Manual”, US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, 1997.
 De Bellie, L. H. F. A., Haghighat, F., and Zhang, Y., “Review of the effect of environmental parameters on material emissions”, In Proceedings of the 2nd international conference on indoor air quality, Ventilation, and Energy Conservation in Buildings, pp. 111-19, 1995.
 No, I.A.F., “Sick building syndrome”, United States Environmental Protection Agency, Research and Development (MD-56), 1991.
 Kumagai, S., “Two offset printing workers with cholangiocarcinoma”, Journal of Occupational Health, 56, 2, pp. 164-168, 2014.
 Yamada, K., Kumagai, S., Nagoya, T., and Endo, G., “Chemical exposure levels in printing workers with cholangiocarcinoma”, Journal of Occupational Health, 56, 5, pp. 332-338, 2014.
 Kamae, K., “Biliary tract cancer cases at printing plants in Japan (1 October 2013/Ver. 12 Since 10 August 2012)”, Ministry of Health, Labour and Welfare, Tokyo, Japan, 2013.
 Kubo, S., Nakanuma, Y., Takemura, S., Sakata, C., Urata, Y., Nozawa, A, and Tachiyama, G., “Case series of 17 patients with cholangiocarcinoma among young adult workers of a printing company in Japan”, Journal of Hepato-Biliary-Pancreatic Sciences, 21, 7, pp. 479-488, 2014.