The permissible exposure level in decibels over 8 hours is?

• A. 75 dB
• B. 85 dB
• C. 95 dB
• D. 65 dB

Answer: (B)

The level most commonly used to protect hearing over an 8-hour period is 85 dBA. This is the point at which exposure is considered acceptable for a full workday without mandatory protection, and it’s the threshold used to guide monitoring and protective measures. In practice, you’d aim to keep average sound in a fitness space at or below 85 dBA during classes so the 8-hour exposure remains within safe limits.

Understanding the timing helps: for every roughly 3 dB increase above 85, the allowable exposure time roughly halves. So at about 88 dBA you’d cap exposure around 4 hours, at 91 dBA about 2 hours, and so on. This is why keeping music and ambient noise at or below 85 dBA is emphasized in safety guidelines and fitness settings alike.