Table 1 Recommended noise exposure thresholds
From: Noise exposure while commuting in Toronto - a study of personal and public transportation in Toronto
| Duration | WHO /EPA (dB) | OSHA (dB) | NIOSH 1997 (dB) |
|---|---|---|---|
| 8 h | 75 | 90 | 85 |
| 4 h | 78 | 95 | 88 |
| 2 h | 81 | 100 | 91 |
| 1 h | 84 | 105 | 94 |
| 30 min | 87 | 110 | 97 |
| 15 min | 90 | 115 | 100 |
| 7 min 30 s | 93 | 103 | |
| 3 min 45 s | 96 | 106 | |
| 1 min 53 s | 99 | 109 | |
| 56 s | 102 | 112 | |
| 28 s | 105 | 115 | |
| 14 s | 108 | 118 | |
| 7 s | 111 | 121 | |
| 4 s | 114 | 124 |