Canada Occupational Health and Safety Regulations (SOR/86-304)

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Regulations are current to 2025-10-28 and last amended on 2025-03-26. Previous Versions

SCHEDULE(Section 7.4)

Maximum Duration of Exposure to A-Weighted Sound Pressure Levels in the Work Place

Column I	Column II
A-weighted sound pressure level (dBA)	Maximum duration of exposure in hours per employee per 24 hour period
87	8.0
88	6.4
89	5.0
90	4.0
91	3.2
92	2.5
93	2.0
94	1.6
95	1.3
96	1.0
97	0.80
98	0.64
99	0.50
100	0.40
101	0.32
102	0.25
103	0.20
104	0.16
105	0.13
106	0.10
107	0.080
108	0.064
109	0.050
110	0.040
111	0.032
112	0.025
113	0.020
114	0.016
115	0.013
116	0.010
117	0.008
118	0.006
119	0.005
120	0.004

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