What is the permissible sound level for hearing protection during an 8-hour shift?

• A. 80 dBa
• B. 85 dBa
• C. 90 dBa
• D. 95 dBa

Answer: (B)

The permissible sound level for hearing protection during an 8-hour shift is established as 85 dBa. This level is significant because it aligns with occupational safety guidelines designed to protect workers from noise-induced hearing loss. The 85 dBa threshold is based on extensive research indicating that exposure to sounds at or above this level over prolonged periods may lead to permanent hearing damage.

Regulatory bodies, such as OSHA in the United States, have determined that sound levels at or below 85 dBa can generally be tolerated by workers without requiring additional hearing protection measures. However, exposure to higher levels of noise—beyond this permissible limit—necessitates the use of hearing protection devices to mitigate the risk of hearing loss. Hearing conservation programs in workplaces often include monitoring noise levels and implementing protective measures when these levels exceed 85 dBa to ensure the safety and well-being of employees.