ADEQ Water Treatment 2 Practice Test

NRR shows how much sound a hearing protection device can reduce before it reaches the ear. For adequate protection in typical workplace noise, the goal is to keep the ear exposure at or below 85 dB for an eight-hour shift. So the device must provide enough attenuation so the final level is 85 dB or lower. This target aligns with standard exposure limits, ensuring long-term hearing safety. The other options don’t fit: 0 dB implies no protection, a nonsensical 185 dB exceeds physical reality, and “over 85 dB” wouldn’t meet the safe exposure limit.