What does a NRR rating mean?

Q.  What does a NRR Rating mean?
A.  NRR, or Noise Reduction Rating, is a rating system set up by the Environmental Protection Agency (EPA) as a guideline that indicates the amount of potential protection a hearing protection device will give in a noisy environment. 
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What does a NRR rating mean?
Article Summary:
A brief definition of NRR rating.
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