What is the maximum sound energy level permissible for workers without hearing protection?

The maximum sound energy level permissible for workers without hearing protection is 85 dB for an eight-hour work shift. This limit is established based on guidelines provided by organizations such as the Occupational Safety and Health Administration (OSHA) and the National Institute for Occupational Safety and Health (NIOSH), which aim to protect workers from potential hearing loss due to prolonged exposure to loud noises.

At sound levels above 85 dB, the risk of hearing damage increases significantly, especially with extended exposure. The eight-hour duration is a standard measurement used to assess daily noise exposure, as it reflects a typical work shift. Noise levels below this threshold are generally considered safe for occupational settings without requiring additional protective measures.

While other levels like 75 dB, 80 dB, and 90 dB may be recognized in various contexts, they do not align with the established guidelines for permissible noise exposure for the duration specified. Therefore, 85 dB for eight hours is identified as the correct standard to help maintain workers' hearing health.