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10.6.14 Noise exposure limits


The noise exposure limit of 90 dBA per 8 hour working day ('daily noise dose' or DND) is the level recommended in the National Health and Medical Research Council 'Model Regulations for Hearing Conservation'.

Should the noise level exceed 90 dBA, the permissible exposure duration decreases by 2 hours per 3 dBA increase in noise level.


  • At 93 dBA, permissible exposure is 6 hours per day.
  • For 96 dBA, permissible exposure is 4 hours per day.
  • Maximum exposure for steady noise without ear protection is 115 dBA, no matter how short the exposure duration.