• For unprotected ears, the allowed exposure time decreases by one-half for each 5 dB increase in the average noise level. For instance, exposure is limited to 8 hours at 90 dB, 4 hours at 95 dB, and 2 hours at 100 dB. • The highest permissible noise exposure for the unprotected ear is 115 dB for 15 minutes/day.
Double hearing protection is recommended for noise levels at or above 105 dBA, about the noise level of a table saw. The dual protective effect will be most noticeable against noises in the lower and middle frequencies (below 2000 Hz).
Hearing protection is part of a hearing conservation program, which is required when noise exposure exceeds the action level [85 decibels on the A scale (dBA)].
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85 decibels (db) – the "Action Level" where hearing protection is required. 90 dB – the OSHA, 8 hour average exposure limit. 100 dB – exposures longer than 15 minutes are not recommended. 110 dB – regular exposure of more than 1 minute risks permanent hearing loss.
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