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2. Hearing protection fit-testing - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_fit-testing

   Hearing protector fit-testing is a method that measures the degree of noise reduction obtained from an individual wearing a particular hearing protection device (HPD) - for example, a noise canceling earplug or earmuff. Fit testing is necessary due to the fact that noise attenuation varies across individuals.

3. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   The United States Environmental Protection Agency (EPA) mandates that hearing protection is rated and labeled. To be rated, hearing protection is tested under ANSI S3.19-1974 to provide a range of attenuation values at each frequency that can then be used to calculate a Noise Reduction Rating (NRR).

4. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Various earmuff hearing protectors. Sound levels of some daily activities. A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise and provide hearing protection to help prevent noise-induced hearing loss.

5. The 7 best OTC hearing aids for seniors, according to ... - AOL

   www.aol.com/lifestyle/the-7-best-otc-hearing...

   An invisible wire connects to a small speaker in the ear canal, which amplifies sound for those with mild-to-moderate hearing loss. It also has an IP67 rating for water and dust resistance, so it ...

6. Earmuffs - Wikipedia

   en.wikipedia.org/wiki/Earmuffs

   The amount of noise reduction from dual hearing protection is NOT a sum of the noise reductions ratings from the two devices. [26] For example, if wearing an earplug with a NRR of 25 dB and an earmuff with an NRR of 20 dB, the combined protection would not be 45 dB. Instead, 5 dB should be added to the higher of the two NRRs. [26]

7. Exposure action value - Wikipedia

   en.wikipedia.org/wiki/Exposure_action_value

   The third aspect is the implementation of hearing protection. Employers must make hearing protection available to all employees who are exposed to noise levels of 85 dB(A) or greater. This is to be at no cost to employees. Employees can pick whichever type of hearing protection they prefer. This also requires an ongoing evaluation of the ...