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• <br /> 1 40 Threshold of Pain <br /> 130 <br /> Jet Take-Off (100m) <br /> 120 <br /> Rock Band 110 <br /> 1 00 Pneumatic Chipper <br /> Train Passing (50-ft) 90 <br /> Average Street Traffic <br /> 80 <br /> 70 <br /> Business Office <br /> Conversational Speech 60 <br /> 50 <br /> Quiet Office 40 Living Room <br /> 30 <br /> Bedroom <br /> 20 <br /> 0 Outside in Rural Area <br /> 1 <br /> Threshold of Hearing <br /> Representative Noise Sources and Sound Levels <br />