['Industrial Hygiene']

['Hearing Conservation and Noise']

03/12/2025

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At what noise level is double hearing protection required?

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At what noise level is double hearing protection required?

RegSense Safety & Health Construction Safety Hearing Conservation and Noise General Industry Safety Industrial Hygiene Best Results FAQ English Focus Area USA

Double hearing protection (or the use of ear muffs and ear plugs at the same time) is needed if using a single hearing protection method doesn’t reduce the employee’s exposure to a safe level.

As usual, there’s some math involved in determining just how much additional protection you get from wearing two types of hearing protection. You don’t simply add the two hearing protector noise reduction rating (NRR) values and use that as the amount of noise reduction. Rather, the precise calculation you need to use is in OSHA’s Technical Manual.