Long-term exposure to hazardous noise mostly affects hair
cells of the organ of Corti resting in inner ear.[10] Injury of these
cells leads to NIHL. The sound frequencies between 3000 and
5000 Hz (especially 4000 Hz) usually cause damage to hair
cells, and the damage is gradually spread to adjacent areas
sensitive to other frequencies, i.e. 6000 and 8000 Hz.[