Hearing protection might be used as an accommodation for an individual who is hard of hearing, who needs to work in a noisy environment and still be able to communicate with co-workers. Active hearing protection and special purpose ear muffs that attenuate sound as the noise level rises, may enable effective performance in moderate noisy environments. Hearing aids may fit under certain muff style hearing protectors that have large, rectangular openings. An audiologist may be helpful in determining whether a particular individual can wear hearing aids under hearing protection and what product combination would best suit their needs.
Hearing protection products have a Noise Reduction Rating (NRR) which is the measure, in decibels, of how well a hearing protector reduces noise; the higher the number, the greater the noise reduction. For example, a NRR 31 provides greater noise reduction than a NRR 24.