PERMISSIBLE NOISE EXPOSURES
Duration Per Day Hours of Exposure | Sound Level Dba Slow Response |
8 | 90 |
6 | 92 |
4 | 95 |
3 | 97 |
2 | 100 |
1 1/2 | 102 |
1 | 105 |
1/2 | 110 |
1/4 or less | 115 |
No exposure shall exceed 115 dBA. Impact or impulsive noises shall not exceed 140 dB, peak sound pressure level.
NOTE: When the daily exposure is composed of two or more periods of noise exposure at different levels, their combined effect shall be considered rather than the individual effect of each. If the sum
(Cl/Tl) + (C2/T2) + . . . (Cn/Tn)
exceeds unity, then the mixed exposure shall be considered to exceed the permissible exposure. Cn indicates the total time of exposure at a specified noise level, and Tn indicates the total time of exposure permitted at that level. Interpolation between tabulated values may be determined by the following formula:
log T = 6.322 - 0.0602 SL
There T is the time in hours and SL is the sound level dBA.
Ariz. Admin. Code § R11-1-475