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Understanding Sound and Noise Levels Environmental Noise Weakest sound heard 0dB Whisper Quiet Library at 6' 30dB Normal conversation at 3' 60-65dB Important Links for Sound and Noise OSHA United States Department of Labor http://www.osha.gov/SLTC/noisehearingconservation/ OSHA United States Department of labor eTool Technical Manual http://www.osha.gov/dts/osta/otm/noise/ I 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