Table D-2-Permissible Noise Exposures
Duration per day, hours | Sound level dBA slow response |
8 | 90 |
6 | 92 |
4 | 95 |
3 | 97 |
2 | 100 |
11/2 | 102 |
1 | 105 |
1/2 | 110 |
1/4 or less | 115 |
Where:
Fe = The equivalent noise exposure factor.
T = The period of noise exposure at any essentially constant level.
L = The duration of the permissible noise exposure at the constant level (from Table D-2).
If the value of Fe exceeds unity (1) the exposure exceeds permissible levels.
110 db A 1/4 hour.
100 db A 1/2 hour.
90 db A 11/2 hours.
Fe = (1/4/ 1/2) + (1/2/2) + (11/2/8)
Fe = 0.500 + 0.25 + 0.188
Fe = 0.938
Since the value of Fe does not exceed unity, the exposure is within permissible limits.
29 C.F.R. §1926.52