Hearing loss is the most common occupational illness in the United States. Over 22 million workers are exposed to hazardous noise levels each year, and an estimated $242 million is spent annually on workers' compensation for hearing loss disability. The worst part? Occupational hearing loss is completely preventable.
This guide explains OSHA's hearing protection requirements, the types of hearing protection available, and how to choose and fit ear protection correctly.
When Is Hearing Protection Required?
OSHA's Occupational Noise Exposure Standard (29 CFR 1910.95) requires employers to implement a Hearing Conservation Program when workers are exposed to noise at or above 85 decibels (dBA) averaged over an 8-hour workday (known as the Action Level).
At or above 90 dBA (the Permissible Exposure Limit), engineering and administrative controls must be implemented. Hearing protection is mandatory when those controls don't reduce exposure to safe levels.
Common Workplace Noise Levels for Reference
- Normal conversation: ~60 dBA
- Power tools (drill, circular saw): 90–100 dBA
- Jackhammer: ~100 dBA
- Chainsaw: ~110 dBA
- Jet engine at 100 feet: ~140 dBA
Remember: the decibel scale is logarithmic. 100 dBA is 10 times more intense than 90 dBA — not just 10% louder.
Types of Hearing Protection
1. Disposable Foam Earplugs
The most common and cost-effective option. Made from slow-recovery polyurethane foam that expands in the ear canal to create a seal. NRR (Noise Reduction Rating) typically ranges from 29–33 dB. Easy to use, but must be inserted correctly to provide rated protection.
Best for: Construction, manufacturing, events, general industry, short-duration noise exposure
2. Reusable Earplugs
Made from silicone, rubber, or flanged plastic. Last longer than foam plugs and are easier to insert consistently. Typically NRR 24–27 dB. Come in corded versions to prevent loss.
Best for: Workers who remove and reinsert earplugs frequently throughout the day
3. Earmuffs
Cup-style earmuffs fit over the entire ear and create a seal against the head. NRR typically 20–31 dB. Easier to put on and take off than earplugs, making them better for intermittent noise exposure. Require a proper seal — glasses, facial hair, and hair can reduce effectiveness.
Best for: Workers who frequently enter and exit noisy environments, supervisors, those who struggle with earplug insertion
4. Electronic Earmuffs
Battery-powered earmuffs that use microphones and speakers to allow normal conversation and situational awareness while automatically suppressing loud sounds above a safe threshold. More expensive but highly practical for environments where communication is important.
Best for: Shooting ranges, military, emergency responders, workers who need to communicate frequently
5. Dual Protection (Earplugs + Earmuffs)
When noise levels exceed 105 dBA, OSHA recommends using both earplugs and earmuffs simultaneously. Combined protection doesn't add the two NRR values together — add 5 dB to the higher-rated device as a practical estimate.
Best for: Extremely loud environments like grinding operations, stamping presses, or blasting
Understanding NRR: Noise Reduction Rating
The NRR is a lab-tested rating measured in decibels. However, real-world protection is typically lower than the stated NRR because of improper fit. OSHA recommends applying a 50% derating factor for earmuffs and a 70% derating factor for earplugs when estimating real-world protection.
Example: Foam earplugs with NRR 33 dB — real-world protection estimate: 33 × 0.30 = ~10 dB reduction. Proper insertion technique dramatically improves this.
How to Insert Foam Earplugs Correctly
- Roll the earplug into a tight, thin cylinder with clean fingers
- With your other hand, reach over your head and pull your ear up and back to straighten the ear canal
- Insert the rolled plug deep into the ear canal
- Hold it in place for 20–30 seconds while the foam expands
- The earplug should fit snugly and feel slightly uncomfortable at first — that means it's properly sealed
If you can clearly hear normal conversation from across a room while wearing properly inserted foam earplugs, they may not be seated correctly.
Hearing Conservation Program Requirements
If workers are exposed to noise at or above 85 dBA, OSHA requires a full Hearing Conservation Program including:
- Noise monitoring to identify exposed workers
- Annual audiometric testing (hearing tests)
- Free hearing protection provided to all exposed workers
- Annual training on hearing loss risks and PPE use
- Recordkeeping of exposure data and audiograms
Shop Hearing Protection at RANOVA USA
RANOVA USA carries a full range of foam earplugs, reusable earplugs, and earmuffs for every noise environment. Browse our hearing protection collection to protect your workforce.