When wearing hearing protection, what is the recommended Noise Reduction Rating (NRR)?

The recommended Noise Reduction Rating (NRR) of at least 20 dB for environments with hazardous noise levels is grounded in the need to effectively protect workers’ hearing from excessive noise exposure. This rating reflects a balance between adequate protection and the necessity of being able to hear important communication or warning signals in a work environment.

Hazardous noise levels are typically considered to be at or above 85 dB, where prolonged exposure can lead to hearing loss. An NRR of 20 dB helps to reduce the noise level to a safer range, thereby minimizing the risk of damage to the auditory system. This standard is well-established in occupational safety and health guidelines, emphasizing the importance of both protecting workers and maintaining a functional acoustic environment.

Choosing an NRR below 20 dB may not provide sufficient noise attenuation in environments where sound levels are significantly high, while opting for an NRR of 30 dB may be excessive in some cases, potentially impeding communication. Having no specific rating fails to prioritize safety and may put workers at an increased risk of hearing impairment.