407355 Version 2.4 9/07 16
Conversion Charts
OSHA Permissible Noise Exposures
Duration per day, hours Sound level dBA, slow response
8 90
6 92
4 95
3 97
2 100
1.5 102
1 105
0.5 110
0.25 or less 115
Source:29 CFR 1910 Table G-16
Conversion from Percent Noise Exposure or Dose to 8-Hour Time Weighted Average
Sound Level(TWA)
Dose or percent TWA (dBA)
50 85.0
55 85.7
60 86.3
65 86.9
70 87.4
75 87.9
80 88.4
85 88.8
90 89.2
95 89.6
100 90.0
105 90.4
110 90.7
115 91.1
120 91.3
125 91.6
Note: Assumes 5-dB exchange rate and 90-dBA Criterion
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