OSHA stands for Occupational Safety and Health Act (passed in 1970), as well as the U.S. governmental "Occupational Safety and Health Association". OSHA sets safety standards for noise.
|Sound level DBA slow response||Hours per day of exposure permitted|
Dobie (2017) notes that "Hearing conservation programs (HCPs) mandated by the US Occupational Safety and Health Administration (OSHA) cost about $350/worker/year" He further states that "Model simulations suggest that HCPs may be cost-effective only when time-weighted average (TWA) noise exposures are ≥ 90 dBA."
OSHA quantifies permissible exposure limits as "PEL". The PEL increases by 5 dB for every halving of exposure duration -- i.e. 95 dB for 4 hours, 100 dB for 2 hours, 105 dB for 1 hour, as noted above. Thus a 130 dB SPL stimulus would have only a very short time frame allowable.