There is a lot of noise pollution out in the world, but in industrial settings it can be much worst. People who work in certain industries, such as construction, entertainment, or factory environments, can lead to damage in the inner ears. The more frequent the exposure, the bigger the risk.
Repeated exposure to noise of 85 dB or higher for a long period of time can result in permanent hearing loss. The noise regulations require that all workers who are routinely exposed to noise levels in excess of 85 decibels be tested annually.
The best defense against hearing loss, as well as conditions such as tinnitus (ringing in the ears), is wearing ear plugs during work hours when exposed to loud noises. Frequent hearing tests are another important part of evaluating hearing damage early, so it can be corrected before issues become chronic.