Protect Against Harmful Noise Noise Reduction Rating: 31 Decibels Soft Comfortable Foam EPA The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (higher numbers denote greater effectiveness). Noise Reduction Rating: 31 Decibels (when used as directed) Information required by EPA The level of noise entering a person s ear when hearing protector is worn as directed is closely approximated by the difference between the A-weighted environmental noise level and the NRR. Example: 1. The environmental noise level as measured at the ear is 92 dBA 2. The NRR is 31 decibels (dB). 3. The level of noise entering the ear is approximately equal to [92 dB(A) - 31] 61 dB(A)