results : most of workers who were working with toxic chemicals had knowledge and awareness of health risks and chemicals hazards at work. we found that safe behavior at work through read the safety information among operational workers less than non-operational workers around 10%. most of workers had perceived occupational health and safety management in their companies. Some companies revealed that they had not been performing biological monitoring of blood or urine for their health examination reports and that workplace exposure monitoring had not correlated well with health examination of workers.