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Lex,8

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Lex,8

80 dB(A) little risk of noise induced hearing loss

85 dB(A) some risk of noise induced hearing loss

where,

Lex,8 is the equivalent sound exposure level in 8 hours,

is the sum of the values in the enclosed expression for all activities from i = 1 to i = n,

i is a discrete activity of a worker exposed to a sound level,

ti is the duration in hours of i,

SPLi is the sound level of i in dBA,

n is the total number of discrete activities in the workers total workday

Questions or comments regarding this calculator should be forwarded to John Oudyk at 1-800-263-2129

The calculations performed in this spreadsheet are based on the following equation taken from O.Reg

565/06 found at: http://www.e-laws.gov.on.ca/DBLaws/Regs/English/900851_e.htm

1 min

20 sec

10 sec

No exposure?

111.8

114.8

Over 115

30 sec

No exposure?

20 min

10 min

5 min

3 min

1

1

40 min

30 min

1

3

3

2

2

Duration

(80 dBA Lex,8)

(hrs/24 hr day)

7

5

Sound Level

(in db(A))

80.25

81.5

Noise Exposure Levels:The following chart estimates roughtly the amount of time it takes toreach either an equivalent 8-hr exposure (Lex,8) of 85 dB(A) or an Lex,8of 80 dB(A).

94.0

88.0

89.25

82.0 5

91.0

92.25

83.25

84.0

85.0

86.25

10

1

97.0

100.0

101.8

104.8

Duration

(85 dBA Lex,8)

(hrs/24 hr day)

24

18

16

12

15 min

10 min

5 min

1 min

30 min

8

6

4

3

2