At what decibel level can prolonged exposure start to cause hearing damage?

Prolonged exposure to noise levels at or above 85 decibels (dB) can lead to hearing damage. This threshold is established based on research that indicates consistent exposure to such noise levels can cause permanent changes in the auditory system, leading to noise-induced hearing loss (NIHL). At 85 dB, even short durations of exposure can be harmful if repeated frequently over time. This is particularly relevant in occupational settings, where workers may be subjected to continuous loud sounds.

In contrast, exposure to lower decibel levels, such as 70 dB, is generally considered safe for longer periods, while levels at 90 dB or higher can result in hearing damage after even shorter durations. The categorization of these noise levels underscores the importance of hearing conservation practices, especially in environments where exposure to loud sounds is common. Therefore, the identification of 85 dB as a pivotal point for potential hearing risk aligns with guidelines set by organizations like the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH).