Hearing Conservation: OSHA's Noise Exposure Standard Explained
Occupational hearing loss is the most common work-related illness in the United States. Approximately 22 million workers are exposed to hazardous noise levels each year, and noise-induced hearing loss is permanent and irreversible. OSHA's Hearing Conservation Standard is designed to prevent this entirely preventable condition.
OSHA's Permissible Exposure Limit (PEL)
OSHA's PEL for noise is 90 decibels (dBA) as an 8-hour time-weighted average (TWA). For every 5 dBA increase in noise level, the permissible exposure time is cut in half:
- 90 dBA: 8 hours
- 95 dBA: 4 hours
- 100 dBA: 2 hours
- 105 dBA: 1 hour
- 110 dBA: 30 minutes
- 115 dBA: 15 minutes
The Action Level
OSHA's Hearing Conservation Standard (29 CFR 1910.95) requires employers to implement a hearing conservation program when workers are exposed to noise at or above 85 dBA as an 8-hour TWA. This is the "action level" — lower than the PEL — because hearing damage begins before the PEL is reached.
Elements of a Hearing Conservation Program
- Noise monitoring: Measure noise levels to identify workers at risk
- Audiometric testing: Annual hearing tests for all workers exposed at or above the action level
- Hearing protection: Provide hearing protectors to all workers exposed at or above the action level
- Training: Annual training on noise hazards and hearing protection
- Recordkeeping: Maintain audiometric test records for the duration of employment plus 30 years
Choosing Hearing Protection
Hearing protectors are rated by their Noise Reduction Rating (NRR). Higher NRR = more protection. Common options include:
- Disposable foam earplugs: NRR 29-33, most economical, single-use
- Reusable earplugs: NRR 25-27, washable and reusable
- Earmuffs: NRR 22-31, easy to put on and remove, compatible with other PPE
- Electronic earmuffs: Allow normal conversation while blocking harmful noise peaks
Engineering Controls First
OSHA prefers engineering controls (noise barriers, quieter equipment, vibration isolation) over hearing protection. Hearing protection is the last line of defense, not the first solution.
Conclusion
Protect your workers' hearing before it is too late. RANOVA USA carries a full range of NIOSH-rated hearing protection including disposable earplugs, reusable earplugs, and earmuffs for every noise environment.
0 comments