An Australian timber mill employee cuts timber to length with a cut-off saw. While the saw idles it produces a level of 85 dBA and when it cuts timber it produces a level of 96 dBA at the work position. If the saw runs continuously and actually only cuts for 10% of the time that it is switched on, compute the A-weighted, 8-hour equivalent noise level. How much must the exposure be reduced in hours to comply with LEX,8h = 85 dBA?

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To compute the Aweighted 8hour equivalent noise level we need to consider the duration of exposure t... View the full answer