According to the research, there are many occupations make workers exposed to a loud noisy workplace for a long time which is easily causing hearing damage without consciousness. Manufacturing, construction, carpentry and mining, motorcycle courier, entertainment and nightlife, airport staff and shooting range marshals are the six top noisiest jobs.
When a person is exposed to loud noise over a long period of time, symptoms of NIHL (Noise-Induced Hearing Loss) will increase gradually. The sounds a person hears may become distorted or muffled in the long run, and it is potentially difficult for the person to understand speech. Even though someone with NIHL is likely not even aware of the loss, it can be detected with a hearing test.
It is always better to prevent rather than cure so choosing a correct protection is what you should do before exposing to a noisy workplace. These methods should be taken in a hierarchical order: Assessment of exposure, using tools and equipments which generate a lower level of noise, regular segregation and insulation, appropriate work practices and personal protection such as ear muffs and ear plugs. So far, many companies now establish a routine audiometry program to avoid increasing number of workers with NIHL.
At a personal level it is possible to protect the ears with ear muffs or ear plugs. If you must work in an excessively noisy environment, wearing protectors is necessary. You should also wear them when you are using power tools, noisy yard equipment, or firearms.