Final answer:
OSHA mandates a hearing conservation program when workers are exposed to 85 decibels or higher over an 8-hour time weighted average to prevent hearing loss.
Step-by-step explanation:
A hearing conservation program is required by OSHA when an employee is exposed to an 8-hour time weighted average of 85 decibels or more. This program is aimed at protecting workers from hearing damage that may result from long-term exposure to excessive noise. It's important for workplaces with high noise levels to adhere to these guidelines to maintain hearing health and prevent potential hearing loss among employees.