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NIOSH says noise averaging what level over an eight-hour day is hazardous to hearing?

85 dBA or higher.

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  1. 65 dBA
  2. 75 dBA
  3. 85 dBA ✔

Why: NIOSH sets its recommended exposure limit at 85 dBA averaged over eight hours. A day around loud shop machines can pass that, so hearing protection matters. Noise damage to hearing is permanent.

Huh, didn't know that: NIOSH calls occupational hearing loss one of the most common work-related illnesses.

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References

Answer: 85 dBA. NIOSH sets its recommended exposure limit at 85 dBA averaged over eight hours. A day around loud shop machines can pass that, so hearing protection matters. Noise damage to hearing is permanent.

  1. NIOSH About Noise and Hearing Loss Prevention www.cdc.gov/niosh/noise/about/index.html
    NIOSH Recommended Exposure Limit (REL) for occupational noise: 85 dBA averaged over an eight-hour workday.
    Checked 2026-10-10.

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