Occupational Noise-Induced Hearing Loss Prevalence and Noise Abatement Techniques in a Steel-Making Plant

ABSTRACT

Background: A high prevalence of noise-induced hearing loss (NIHL) is observed amongst employees in the steel manufacturing industry.Objective: To determine the prevalence of NIHL and current noise abatement techniques implemented at a steel manufacturing plant.Methods: Structured questionnaires were completed by permanent employees at a steel-manufacturing plant for the purpose of collecting information on occupational and medical histories; noise exposure in and outside the work environment; use of hearing protection devices (HPDs); andcurrent noise abatement procedures. A walk-through survey was also conducted to observe implemented noise abatement techniques using the Noise Induced Hearing Loss Regulations of 2003 as a guideline.Results: A total of 17.9% of workers suffered from NIHL (95% CI 11.8% - 22.5%). Administrative controls; lubrication and mufflers were identified by more than 70% of the respondents as control procedures most often implemented by the company. Most of the respondents (77%) used HPDs always and 97% indicated that they fit their HPDs at the beginning of the shift.Conclusion: NIHL remains a significant health problem in this steel industry despite the implementation of noise abatement techniques and the implementation of a noise conservation programme with all the required elements