Occupational Health and Safety Code

The Occupational Health and Safety Code provides specific technical health and safety rules and requirements for Alberta workplaces.

Alberta Regulation 191/2021

Schedule 3 Noise

Contents

 

Table 1
Occupational exposure limits for noise

[ See sections 218, 219(1) ]

 

Exposure level (dBA)

Exposure duration

82

16 hours

83

12 hours and 41minutes

84

10 hours and 4 minutes

85

8 hours

88

4 hours

91

2 hours

94

1 hour

97

30 minutes

100

15 minutes

103

8 minutes

106

4 minutes

109

2 minutes

112

56 seconds

115 and greater

0

Note:   Exposure levels and exposure durations to be
prorated if not specified.

 

Table 2
Selection of hearing protection devices

[ See section 222(1) ]

 

Maximum equivalent
noise level (dBA Lex)

CSA Class

CSA Grade

≤ 90

C, B or A

1, 2, 3, or 4

≤ 95

B or A

2, 3, or 4

≤ 100

A

3 or 4

≤ 105

A

4

≤ 110

A earplug +

A or B earmuff

3 or 4 earplug +

2, 3, or 4 earmuff

> 110

A earplug + A or B earmuff and limited exposure time to keep sound reaching the worker’s ear drum below 85 dBA Lex

3 or 4 earplug + 2, 3, or 4 earmuff and limited exposure time to keep sound reaching the worker’s ear drum below 85 dBA Lex

 

Table 3
Permissible background noise conditions during audiometric testing

[ See section 223(2) ]

 

Octave band centre
frequency (Hz)

Maximum level
(dB)

500

22

1000

30

2000

35

4000

42

8000

45