85d is the threshold for an 8hr exposure, before expected irreversible damage. A good general rule of thumb is if you have difficulty hearing a person next to you you are close to it. My buddies at the dayjob and I have an app that measures d. Our local jimmy johns is generally over 85d and after just a lunch break in there you can feel your ears hurt.
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Hearing Protection
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E.L.Cooley
- Posts: 363
- Joined: Thu Feb 13, 2014 3:36 pm
- Location: Colorado Springs, Co