5
Attention
Hearing Damage
Avoid using headphones with the
volume turned up for an extended
period of time. Following are
guidelines by Occupational Safety
and Health Administration and CDC,
NIOSH:
dB SPL Occupational noise
exposure 1991
NIOSH and CDC
2002
85 8 hours
88 8 hours (90 dB SPL) 4 hours
91 6 hours (92 dB SPL) 2 hours
94 4 hours (95 dB SPL) 1 hour
97 3 hours 30 min
100 2 hours 15 min
103 1.5 hours (102 dB SPL) 7.5 min
106 1 hour (105 dB SPL) < 4 min
109 30 min (110 dB SPL) < 2 min
112 ~ 1 min
115 15 min ~ 30 sec
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