In locations where noise levels exceed 104 dBA, personnel are required to wear what type of hearing protection?

In environments where noise levels exceed 104 dBA, personnel are required to use double hearing protection. This typically involves the combination of earplugs and earmuffs. The reason for this requirement is that sustained exposure to high noise levels can lead to permanent hearing loss, and double protection significantly reduces the amount of sound that reaches the inner ear.

Using both earplugs and earmuffs is particularly effective in these scenarios since it provides a higher total noise reduction and protects against the risks associated with such intense sound environments. This dual layer of protection ensures that personnel can work safely without compromising their hearing, fulfilling safety regulations and maintaining their health in the workplace.