Group of workers who were not learning on safe use of chemical, did not know what kind of chemicals that they exposed to in the working environment, did not know the possibility of chemicals causing occupational diseases, had increased risk of hearing impairment by 1.85; 1.88 and 2.14 times, respectively. However, only the factor of knowledge on organic solvents causing occupational diseases was a statistically significant risk factor for hearing loss with p < 0.05.