10.2: The 2-3 Foot Rule and Noise Indicator

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Page ID: 63359

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When a sound level meter is not available, you should use the 2-to-3 foot rule: stand about an arm’s length away from your coworker: If you have to raise your voice to be heard 2-3 feet away, you should assume that the sound level is at or above 85 dBA. A personal noise indicator is a warning device. It indicates if your immediate exposure is less than or greater than 85 dBA. It flashes green if the sound level is under 85 dBA and red when above 85 dBA.

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