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2. Permissible exposure limit - Wikipedia

   en.wikipedia.org/wiki/Permissible_exposure_limit

   OSHA's PEL for noise exposure is 90 decibels (dBA) for an 8-hour TWA. Levels of 90-140 dBA are included in the noise dose. [4] PEL can also be expressed as 100 percent “dose” for noise exposure. When the noise exposure increases by 5 dB, the exposure time is cut in half. [5] According to OSHA, a 95dBA TWA would be a 200 percent dose. [6]

3. Occupational hearing loss - Wikipedia

   en.wikipedia.org/wiki/Occupational_hearing_loss

   Relationship between noise exposure levels and duration of allowable exposure at that level for NIOSH and OSHA Time to reach 100% noise dose Exposure level per NIOSH REL Exposure level per OSHA PEL 8 hours 85 dBA 90 dBA 4 hours 88 dBA 95 dBA 2 hours 91 dBA: 100 dBA 1 hours 94 dBA: 105 dBA 30 minutes 97 dBA: 110 dBA 15 minutes

4. Exposure action value - Wikipedia

   en.wikipedia.org/wiki/Exposure_action_value

   An Exposure Action Value (EAV) or Action Value (AV) is a limit set on occupational exposure to noise where, when those values are exceeded, employers must take steps to monitor the exposure levels. These levels are measured in decibels. The American Occupational Safety and Health Administration (OSHA) set the EAV to 85 dB

5. Recommended exposure limit - Wikipedia

   en.wikipedia.org/wiki/Recommended_exposure_limit

   National Institute for Occupational Safety and Health (NIOSH) RELs are designed to protect the health and well-being of workers by recommending safe exposure levels. To really use these guidelines well, safety professionals need to understand the recommended exposure levels, how to measure them, and ways to make sure workers aren't exposed to harmful stuff.

6. Threshold limit value - Wikipedia

   en.wikipedia.org/wiki/Threshold_limit_value

   Threshold limit value − time-weighted average (TLV-TWA): The average exposure on the basis of a 8 hours per day, 40 hours per week work schedule. Threshold limit value − short-term exposure limit (TLV-STEL): A 15-minute TWA exposure that should not be exceeded at any time during a workday, even if the 8-hour TWA is within the TLV-TWA.

7. Occupational noise - Wikipedia

   en.wikipedia.org/wiki/Occupational_noise

   Occupational noise is the amount of acoustic energy received by an employee's auditory system when they are working in the industry. Occupational noise, or industrial noise, is often a term used in occupational safety and health, as sustained exposure can cause permanent hearing damage.