When should both insert type and muffs be used for hearing protection?

Using both insert type earplugs and muffs for hearing protection is recommended when noise levels consistently exceed 104 dB. At this level, the risk of hearing loss becomes significantly higher, and the use of dual protection provides a greater level of attenuation from hazardous noise. The combination of insert earplugs and muffs effectively reduces the amount of noise that reaches the inner ear, helping to safeguard hearing in environments with extreme noise levels.

In addition, at noise levels above this threshold, relying on just one form of protection may not be sufficient to prevent potential damage to hearing, thus the use of both types becomes crucial. This practice follows established guidelines for occupational safety and health, emphasizing the importance of protecting workers in high-noise environments to prevent long-term hearing impairment.

Other options refer to different noise levels or contexts for hearing protection but do not align with the critical point at which dual protection is essential for adequate safety.