The NIOSH recommended exposure limit is 85 dBA over an eight-hour shift

NIOSH (the U.S. National Institute for Occupational Safety and Health) sets 85 A-weighted decibels (dBA) over an eight-hour shift as the recommended exposure limit (REL) for occupational noise. Workplace noise at or above this level, repeated regularly, causes permanent noise-induced hearing loss. A simple field heuristic: if you must raise your voice to speak with someone at arm’s length, noise is probably at or above the hazardous threshold. Hearing loss from noise exposure is 100% preventable — the REL exists to keep exposures below the damage threshold. This baseline applies directly to performers, sound engineers, and anyone working in loud club or festival environments.

Examples

A DJ booth measuring 90 dBA would exceed the REL. Under NIOSH guidelines, safe exposure at 90 dBA is only about 2 hours. A sound engineer spending a full 8-hour festival shift at 88 dBA receives a dose above the REL.

Assessment

State the NIOSH REL in dBA and shift duration. Identify two environments in a music performance context where this limit is routinely exceeded.