At what noise level should exposure time be cut in half according to OSHA's exchange rate?

The correct answer is based on OSHA’s permissible noise exposure guidelines, specifically regarding how exposure time is affected by increases in noise level. According to the OSHA exchange rate, for every increase of 5 dB(A) in noise level, the allowable exposure time is cut in half. This means that if a worker is exposed to a noise level of 90 dB(A) for a certain amount of time, if the noise increases to 95 dB(A), the time they can safely be exposed without risking hearing damage is reduced by half.

This standard is based on research that shows the relationship between noise levels and the risk of hearing damage, establishing a clear framework for occupational safety. It underscores the importance of monitoring and managing noise exposure in various environments to protect workers' hearing health.