Mahmoud Mohammadyan - Mazandaran University of Medical Science, Sari, Iran
Jamshid Yazdani Charati - Mazandaran University of Medical Science, Sari, Iran
Raziye Yousefinejad - Mazandaran University of Medical Science, Sari, Iran
Rahman Zare - Mazandaran University of Medical Science, Sari, Iran

Background and Purpose: Wood dust have been approved as a harmful and carcinogenic agent for humans. This study aimed to evaluate risk assessment of Workers' exposure to inhalable wood dust among ۱۰۰ workers in ۲۵ furniture manufacturing workshops in one of the northern cities in Iran. Materials and Methods: NIOSH۰۵۰۱ method was used to assess the occupational exposure to Inhalable wood dust and Semi-quantitative risk assessment method recommended by Singapore Department of Occupational Health was used to assess risk level of occupational exposure. Airborne particles were collected from the workers' breathing zone using calibrated personal sampler pump and a PVC filter with a ۲۵ mm diameter, ۵ µm pore size embedded inside an IOM Sampler. Results: The mean occupational exposure to inhalable wood dust among all exposed workers was found to be ۲۲.۳ ± ۶.۹ (Mean ± SD) mg.m-۳. The risk level of workers' exposure to inhalable wood dust was also documented to be in medium level in all workshops. In addition, the researchers found that among environmental variables, the door area of workshops was the most effective predictor variable to predict variations of workers' exposure to inhalable wood dust (ADJ.R۲=۰.۱۱۳, R۲=۰.۱۲۲, p<۰.۰۰۱). Conclusion: Exposure to inhalable wood dust was several times higher than the OEL of Iran and TLV recommended by ACGIH. Since the risk level of workers' exposure to inhalable wood dust was in medium level, their health could be threatened by prolonged exposure. Therefore, technical-engineering and managerial controls seemed to be necessary.

Wood dust, Occupational Exposure, Risk Assessment, Furniture