Which type of HPD is adequate for hearing protection when hazardous noise levels are below 95 dB(A)?

The type of hearing protection device (HPD) that is considered adequate for protecting against hazardous noise levels below 95 dB(A) is ear canal caps. These devices are designed to fit over the ear canal and provide a reasonable level of hearing protection in environments where noise exposure is not excessively high. They are often less intrusive and can be more comfortable for intermittent use compared to fully inserted ear plugs.

Ear canal caps balance protection and convenience, making them suitable for situations where noise levels are below the specified threshold. Other types of HPDs, like custom ear plugs and disposable ear plugs, may provide better protection, but they are often used in scenarios with higher noise exposure. Hand-formed ear plugs, while also effective, may require more effort to properly fit and mold to the ear, which is not necessary for noise exposures below 95 dB(A).

The effectiveness of ear canal caps in moderate noise environments makes them a practical option for hearing conservation in such settings.