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Effectively, OSHA has two noise limits that apply simultaneously.
First, employees may not be exposed to a full-shift (8-hour) time-weighted average noise level of 90 dB (deciBells) or more. This translates to a limit of:
90 dB averaged over an 8 hour day, or
95 dB for 4-hours as long as the rest of the day does not involve exposure to noise greater than 90 dB, or
100 dB for 2 hours,
105 dB for 1-hour,
110 dB for 30 minutes,
115 dB for 15 minutes,
and no continuous noise louder than 115 dB
In addition, employees who have 8-hour exposures of 85 dB or more must be placed in a Hearing Conservation Program and, in some cases must be provided with hearing protection. The table is a bit different because sounds from 80 dB and above are used in the assessment. This translates to a criterion level of:
85 dB averaged over an 8-hour day, or
90 dB for 4-hours for 4-hours as long as the rest of the day does not involve exposure to noise greater than 80 dB, or
95 dB for 2 hours,
100 dB for 1 hour,
105 dB for 30 minutes,
110 dB for 15 minutes
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