Which sound level is most likely to cause hearing loss in the workplace?

The sound level that is most likely to cause hearing loss in the workplace is 85 dB. Continuous exposure to sounds at or above this level can lead to a condition known as noise-induced hearing loss (NIHL). The threshold of 85 dB is significant because research indicates that prolonged exposure to this noise level can damage the hair cells in the cochlea, a critical part of the inner ear responsible for hearing.

When noise levels reach 85 dB or higher, protective measures such as hearing protection devices become essential, particularly in occupational settings where workers may be exposed to these sound levels for extended periods. The National Institute for Occupational Safety and Health (NIOSH) recommends that employers implement hearing conservation programs when noise exposures reach this level to mitigate the risk of hearing impairment among workers.

In contrast, while sound levels of 70 dB are generally considered safe for prolonged exposure, levels of 90 dB and 100 dB present even greater risks for quicker onset of hearing loss, particularly with continued high exposure. However, the threshold for initiating preventive measures and recognizing risk factors primarily starts at 85 dB.