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https://www.chem.purdue.edu/chemsafety/Training/PPETrain/dblevels.htm
https://www.osha.gov/noise
An effective hearing conservation program must be implemented by employers in general industry whenever worker noise exposure is equal to or greater than 85 dBA for an 8 hour exposure or in the construction industry when exposures exceed 90 dBA for an 8 hour exposure. This program strives to prevent initial occupational hearing loss, preserve and protect remaining hearing, and equip workers …
https://www.cdc.gov/niosh/topics/noise/reducenoiseexposure/regsguidance.html
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 over an 8-hour work shift, will reach 100% of their daily noise dose.
https://www.reference.com/science/loud-80-decibels-55b434cc4de10d3c
According to Purdue University, 80 decibels (dB) is approximately as loud as a garbage disposal or a dishwasher. It is possible for ears to be damaged if exposed to 80 decibels for eight hours. Decibels are used to measure the intensity of sound on a logarithmic scale. For every increase of 10 decibels, the sound is considered to be twice as loud. Another way to imagine the intensity of 80 …
https://pubmed.ncbi.nlm.nih.gov/10912379/
At 80 dB(A) there is no material risk in the vast majority of individuals. At 85 dB(A) there is a marginal risk with susceptible individuals accruing a significant hearing impairment from a lifetime of exposure. At 90 dB(A) and above the risk becomes material, with the majority …
https://www.osha.gov/laws-regs/standardinterpretations/2001-09-26
Some people believe it should be 90 decibel (dBA) and others think it should be 80 dBA. Reply: OSHA uses a 90 dBA criterion level, hence the 8-hour time weighted average (TWA) of 85 dBA being equal to a 50% dose.
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.ccohs.ca/oshanswers/phys_agents/exposure_ext.html
86.99. 16. 80.00. 85.00. The noise exposure limit for a 12-hour shift using an exchange …
https://www.cdc.gov/nceh/hearing_loss/what_noises_cause_hearing_loss.html
https://pulsarinstruments.com/en/post/decibel-chart-noise-level
Even a small increase in decibels has a large impact on how intense a sound is, for example - 90dB(A) is 10 times more intense than 80dB(A), where 80dB(A) is the Lower Exposure Action Value in most Health and Safety legislation. After prolonged exposure to decibel levels above 80 dB(A) people can start to suffer from permanent hearing loss.
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