DID YOU KNOW?
9% of high cholesterol and 14% of high blood pressure cases have been linked to occupational noise exposure. [2] Hearing loss isn't the only risk — loud environments can impact your heart, too.
STAY INFORMED
- Hearing protection is required when noise exceeds 85 decibels (dBA), averaged over 8 hours. But in extreme noise environments, a single layer of protection may not be enough.
- Hearing protection is rated using a Noise Reduction Rating (NRR), typically found on earplugs or earmuffs packaging. However, real-world effectiveness is usually lower than labeled. [1]
- Double hearing protection means wearing both earplugs and earmuffs together. This is recommended when exposure exceeds 100 dBA — a level common around jackhammers, aircraft, and industrial equipment. [1]
- OSHA's Appendix B to 29 CFR 1910.95 provides guidance on adjusting NRR values to better reflect actual noise reduction. [1]
HELPFUL TIPS
1. Know Your Exposure and NRR
- First, measure the dBA noise level at the worksite, then identify the NRR values for available hearing protection. If in doubt, consult a safety officer or industrial hygienist.
2. Apply OSHA’s Correction Formula
- Subtract 7 dB from the device’s NRR, then divide the result by 2 to estimate actual protection for a single device. For dual protection, add 5 dB to the higher NRR value to account for combined effect. [1]
3. Use Double Protection When Needed
- If calculated exposure remains above 85 dBA after using one protector, double up with both earplugs and earmuffs for added safety.
HEARING SAFETY REMINDER
Once hearing is damaged, it doesn’t come back. Double hearing protection may seem excessive — until you realize how quickly damage can occur in high-noise environments. Protect your ears and your long-term health.