According to the National Institute for Occupational Safety and Health, the maximum exposure time at
85 dBA: 8 hours.
110 dBA: one minute and 29 seconds
If you must be exposed to noise, it is recommended that you limit the exposure time and/or wear hearing protection. A three dBA increase doubles the amount of noise, and halves the recommended amount of exposure time.
Noise levels above 140dBA can cause damage to hearing after just one exposure.
0 The softest sound a person can hear with normal hearing
10 normal breathing
20 whispering at 5 feet
30 soft whisper
60 normal conversation
110 shouting in ear
130 car revving
noise is physical assault.
Car revving is first degree attempted murder.