This information explains how loud noise can cause hearing loss, which can be temporary or permanent. It details the process of hearing, from sound waves entering the ear to being interpreted by the brain, and highlights how excessive noise damages delicate structures in the inner ear, like hair cells and the auditory nerve. Repeated or intense exposure to loud sounds can lead to cumulative damage and difficulty understanding speech, even resulting in "hidden hearing loss". Finally, the text includes recommendations from the WHO and CDC/NIOSH regarding permissible noise exposure limits to prevent hearing impairment, and notes a situation where noise levels from loudspeakers exceed safe limits, potentially harming nearby individuals.