Noise Induced Hearing Loss
- Levels of Environmental Sounds
 
Source—Safe Levels
dBA SPL
Heavy Traffic
80 
Automobile  (at 20 meters)
70
Vacuum Cleaner
65
Conversational Speech (at 1 meter)
60
Quiet Business Office
50
Residential Area at Night
40
Whisper, Rustle of Leaves
20
Rustle of Leaves
10
Threshold of Audibility
 0