What is the maximum permissible dBA level for which hearing protection is required?

The correct answer regarding the maximum permissible dBA level for which hearing protection is required is 90 dBA. At this noise level, prolonged exposure can lead to hearing damage, making the use of hearing protection essential to prevent potential hearing loss.

The Occupational Safety and Health Administration (OSHA) recommends that when workers are exposed to noise levels above 90 dBA averaged over an 8-hour work shift, hearing protection must be provided and used. This threshold is based on research that shows that sound levels at or above this point can cause hearing impairment over time.

In contrast, lower levels such as 85 dBA are considered the action level, where employers are required to implement a hearing conservation program. Levels significantly higher, such as 143 dBA, exceed the limits of what is typically considered safe for human hearing and would usually require immediate action, including the use of hearing protection. Therefore, while it’s important to consider all surrounding circumstances related to noise exposure, 90 dBA serves as the specific threshold for mandatory hearing protection.