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https://www.cdc.gov/nceh/hearing_loss/toolkit/quiz-test.html
To protect the public health and welfare, in 1974 the Environmental Protection Agency determined a 24-hour exposure limit level of 70 dB would produce minimal hearing loss. In 1999, the World Health Organization Guidelines for Community Noise concluded that a 24-hour equivalent sound level of 70 dB or below would be expected to avoid hearing impairment in 95% of people, even over a lifetime …
https://www.noisehelp.com/noise-dose.html
The generally accepted standard to minimize hearing risk is based on an exposure to 85 dBA for a maximum limit of eight hours per day, followed by at least ten hours of recovery time at 70 dBA or lower (at which the risk of harm to healthy ears is negligible). Then a "3-dB exchange rate" formula is applied, which means that for every 3 dB above 85 dBA, the maximum exposure time is cut in half.
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.95
Hearing protectors may be used as a substitute for the requirement that baseline audiograms be preceded by 14 hours without exposure to workplace noise. 1910.95(g)(5)(iv) The employer shall notify employees of the need to avoid high levels of non-occupational noise exposure during the 14-hour period immediately preceding the audiometric examination.
https://www.osha.gov/noise
The National Institute for Occupational Safety and Health (NIOSH) has recommended that all worker exposures to noise should be controlled below a level equivalent to 85 dBA for eight hours to minimize occupational noise induced hearing loss. NIOSH has found that significant noise-induced hearing loss occurs at the exposure levels equivalent to the OSHA PEL based on updated information obtained …
https://www.cdc.gov/niosh/topics/noise/reducenoiseexposure/regsguidance.html
Sep 13, 2000 · These limits are based on a worker’s time weighted average over an 8 hour day. With noise, OSHA’s permissible exposure limit (PEL) is 90 dBA for all workers for an 8 hour day. Occupational standards specify a maximum allowable daily noise dose, expressed in percentages. For example, a person exposed to 85 dBA per NIOSH or 90 dBA per OSHA ...
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