Noise, or unwanted sound, is one of the most common occupational health problems.  It is a by-product of many industrial processes. Exposure to high levels of noise causes hearing loss and may cause other harmful health effects as well.  The extent of damage depends primarily on the intensity of the noise and the duration of the exposure.  Noise-induced hearing loss can be temporary or permanent.  Temporary hearing loss results from short-term exposures to noise, with normal hearing returning after a period of rest.  Generally, prolonged exposure to high noise levels over a period of time gradually causes permanent damage.



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