Acts and Regulations

91-191 - General

Section 30
Disposition versions

Full text
Maximum exposure of employee to noise
30(1)An employer shall ensure that the exposure of an employee to noise is kept as low as is practical and does not exceed the following exposures:
Sound level
Duration per day
dBA
Hours
  80
24
  82
16
  85
  8
  88
  4
  91
  2
  94
  1
  97
½
100
¼
30(2)An employer shall ensure that when the daily noise exposure is composed of periods of noise exposure at substantially different levels, their combined effect is considered, rather than the individual effect of each, according to the following formula:
If the sum of the following fractions:
C1
+
C2
+
....
Cn
T1
T2
Tn
exceeds unity, then the mixed exposure is considered to exceed the relevant exposure prescribed in subsection (1). C1 indicates the total duration of exposure at a specific noise level, and T1 indicates the total duration of exposure permitted at that level. All job noise exposures of 80 dBA or greater shall be used in the above calculations.
30(3)An employer shall ensure that no employee is exposed to continuous, intermittent or impact noise in excess of a peak C-weighted level of 140 dB, using a Type 2 sound level meter that is set to use the A-weighted network with slow meter response.
2001-33