OSHA vs NIOSH Noise Limits at Work
In the US, two agencies set workplace noise guidance. OSHA sets the legal limit, while NIOSH recommends a stricter, more protective standard.
⏱️ Safe Listening Time
Key points
- OSHA legal limit: 90 dBA averaged over an 8-hour shift, using a 5 dB exchange rate.
- NIOSH recommendation: 85 dBA over 8 hours, using a stricter 3 dB exchange rate.
- The 3 dB exchange rate (NIOSH) better reflects how damage actually accumulates.
- Employers must provide hearing protection and monitoring above set action levels.
- When in doubt, follow the stricter NIOSH 85 dB / 3 dB guidance to protect your hearing.
FAQ
What is the OSHA noise limit?
90 dBA over an 8-hour workday is the legal permissible exposure limit, with a 5 dB exchange rate. NIOSH recommends a stricter 85 dB with a 3 dB rate.
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