CAOHC Practice Test 2025 – Complete Exam Prep Resource

The correct answer is based on OSHA regulations that outline how sound exposure limits correlate with time-weighted averages (TWAs) for occupational noise. According to OSHA, for every 5 dB increase in noise level, the permissible exposure time is halved. This is known as the exchange rate and is crucial in the context of assessing and managing noise exposure in the workplace.

For instance, if the permissible exposure limit (PEL) is set at 90 dBA for an 8-hour workday, an increase to 95 dBA would reduce the safe exposure time to 4 hours due to the 5 dB exchange rule. This regulation is significant because it helps ensure that hearing conservation programs are effective in protecting workers from noise-induced hearing loss by adhering to established guidelines for exposure limits.

Understanding this exchange rate is vital for occupational health professionals, as it assists in assessing risks and implementing appropriate hearing conservation measures based on noise levels encountered in various work environments.