Editing Permissible exposure limit (section)

===OSHA===
The current PEL for OSHA  standards are based on a 5 [[decibel]] exchange rate. 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.<ref>{{cite book |last1=Rawool |first1=Vishakha |title=Hearing Conservation in Occupation, Education, and Home Settings |date= 19 September 2011 |publisher=Thieme Publishers, Inc. |location=New York|isbn=978-1604062564 |pages=33}}</ref> PEL can also be expressed as 100 percent “dose” for noise exposure. When the noise exposure increases by 5&nbsp;dB, the exposure time is cut in half.<ref>{{cite web |title=OSHA Fact Sheet |url=https://www.osha.gov/Publications/laboratory/OSHAfactsheet-laboratory-safety-noise.pdf |website=OSHA |access-date=21 November 2018}}</ref> According to OSHA, a 95dBA TWA would be a 200 percent dose.<ref>{{cite web |title=Permissible Noise Exposures |url=https://www.osha.gov/SLTC/noisehearingconservation/pel.html |website=OSHA |access-date=20 November 2018}}</ref> PEL is exceeded when TWA > 90 dBA. OSHA requires feasible engineering OR [[administrative controls]], and mandatory hearing protection when the PEL is exceeded.