Miners have the highest incident of noise-induced hearing loss amongst all occupations.
Nearly 80% of American miners are exposed to noise levels that exceed 85 dBA. 25% of these miners are exposed to noise levels higher than the 90 dBA Permissible Exposure Limit (PEL).
90% of all coal miners above the age of 50 have a hearing impairment. By the time coal miners retire, they are nearly guaranteed a moderate hearing loss.