Understanding Sound and Noise Levels
Environmental
Noise
Weakest sound heard
0dB
Whisper Quiet Library at 6'
30dB
Normal conversation at 3'
60-65dB
Sound and Noise Exposure Facts Any exposure to noise above 85dB can damage the human hearing; as a rule of thumb, the ambient sound is too loud if you can not carry on a conversation without raising your voice. Occupational noise