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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