Hearing Protection and Noise Reduction

Hearing Protection Use

• Voluntary use of hearing protection is recommended when exposed to an 8-hour Time Weighted Average (TWA) of 85-90 decibels (dB).
• Mandatory use of hearing protection is required when:
• Exposed to an 8-hour TWA of 90 dB.
• Exposed to an 8-hour TWA of 85 dB and have suffered a Standard Threshold Shift (STS) or have not had a baseline hearing test.

Hearing Protection Devices

• Hearing protection devices must reduce employee noise exposure below an 8-hour TWA of 90 dB.
• For employees with STS, noise exposure must be reduced below an 8-hour TWA of 85 dB.
• Noise reduction ratio (NRR) is a key factor in selecting effective hearing protection devices.

Earplugs and Canal Caps

• Earplugs and canal caps must be properly inserted to seal the ear canal.
• To insert, slowly roll and compress foam into a cylinder, then insert into the ear canal while compressed.
• Earplugs keep noise from reaching the eardrum.
• Cotton is not a suitable earplug.

Earmuffs

• Earmuffs must seal against the head with ears fully enclosed.
• Ensure hair is out from under the muffs, and glasses and caps do not interfere with the seal.
• Adjust the headband to exert even pressure.
• Clean earmuffs with warm, soapy water and rinse.

Key Reminders

• Hearing is a vital sense that can be easily damaged.
• Noise exposure of 85 dB or more can cause hearing loss.
• Hearing loss is permanent and cannot be cured or repaired.
• Annual hearing tests can detect hearing loss.
• Hearing protection devices must be worn in high-noise areas to prevent hearing loss.