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The Federal Noise Standard For Employee Exposure As Developed By OSHA

(Occupational Safety & Health Administration)
 

Key Points
  • 8 hours at 90 dBA equals the permissible exposure level (100% dose)
  • 8 hours at 85 dBA equals 50% of the permissible exposure level (PEL)
  • The OSHA Standard was formulated to minimize not eliminate the risk of hearing loss
  • Dosimeters, not sound level meters, are used to establish employee exposure/dose
  • Feasible engineering controls MUST be implemented when the equivalent dose for 8 hours exceeds 90 dBA or where continuous noise is over 115 dBA
  OSHA Derating
Instructions For All
Hearing Protectors
Using NIOSH Method #2

  1. Take NRR from package    29 NRR
  2. Subtract (7) dB               – 7dB

    3.                                      22
  3. Divide by (2) or 50%       ÷ 2
  4. OSHA adjusted NRR           11

Noise and Vibration Control, Inc.
1-610-863-6300

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