What is Noise-Induced Hearing Loss?
How noise is measured
Noise levels are typically measured in dB(A), a decibel scale which represents the human ear's sensitivity to different sound levels. As a reference, a person exposed to noise at 85 decibels, may experience permanent hearing damage after 8 continuous hours of exposure.
The louder the sound, however can shortened the duration (in hours) that can contribute to a permanent loss. A 95 dB sound exposure can cause hearing damage only after one hour, and at 105 dB in less than 15 minutes. Sounds over 120 dB (such as loud rock concerts and fireworks) can cause ear damage for some immediately. Decibels above 140 dB will cause physical pain.