| NOISE LEVEL dB(A) | MAXIMUM PERMISSIBLE DAILY EXPOSURE |
|---|---|
| 85 | 8 hours |
| 86 | 7 hours |
| 87 | 6 hours |
| 88 | 5 hours |
| 89 | 4 hours and 30 minutes |
| 90 | 4 hours |
| 91 | 3 hours and 30 minutes |
| 92 | 3 hours |
| 93 | 2 hours and 40 minutes |
| 94 | 2 hours and 15 minutes |
| 95 | 2 hours |
| 96 | 1 hour and 45 minutes |
| 98 | 1 hour and 15 minutes |
| 100 | 1 hour |
| 102 | 45 minutes |
| 104 | 35 minutes |
| 105 | 30 minutes |
| 106 | 25 minutes |
| 108 | 20 minutes |
| 110 | 15 minutes |
| 112 | 10 minutes |
| 114 | 8 minutes |
| 115 | 7 minutes |
1. For the purpose of applying Tolerance Limits, Continuous or Intermittent Noise is defined as noise that is not impact noise.
2. Continuous or intermittent noise levels should be measured in decibels (dB) using a sound level meter operating on the “A” weighting circuit and slow response (SLOW) mode. Readings should be taken close to the worker’s ear.
3. Exposure times to noise levels should not exceed the tolerance limits set in the table of this annex.
4. For intermediate noise level values, the maximum permissible daily exposure corresponding to the next higher level will be considered.
5. Exposure to noise levels above 115 dB(A) is not allowed for individuals who are not adequately protected.
6. If there are two or more periods of exposure to noise of different levels during the workday, their combined effects must be considered, such that if the sum of the following fractions:
C1/T1 + C2/T2 + C3/T3 + … + Cn/Tn
exceeds one, the exposure is above the tolerance limit.
In the above equation, Cn indicates the total time the worker is exposed to a specific noise level, and Tn indicates the maximum permissible daily exposure to that level according to the table of this Annex.
7. Activities or operations that expose workers to continuous or intermittent noise levels above 115 dB(A) without adequate protection will pose a serious and imminent risk.