| Maximum permitted duration of exposure to  | |
| Level dBA | Maximum duration of exposure in hours per employee per 24 hours | 
| 83 | 20 | 
| 84 | 16 | 
| 85 | 13 | 
| 86 | 10 | 
| 87 | 8.0 | 
| 88 | 6.4 | 
| 89 | 5.0 | 
| 90 | 4.0 | 
| 91 | 3.2 | 
| 92 | 2.5 | 
| 93 | 2.0 | 
| 94 | 1.6 | 
| 95 | 1.3 | 
| 96 | 1.0 | 
| 97 | 0.80 | 
| 98 | 0.64 | 
| 99 | 0.50 | 
| 100 | 0.40 | 
| 101 | 0.32 | 
| More than 102 | 0.00 |