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0 0 <br />Typical Sound Levels <br />(expressed as decibels) <br />Tractor and <br />PTO Sprayer <br />at 40 ft (98.4 db) <br />FEBRUARY 24, 1998 <br />140 Threshold of Pain <br />Jet Takeoff at 100 m <br />flKII <br />Discotheque <br />100 <br />Jackhammer at 15 m <br />80 Heavy Truck at 15 m <br />Vacuum Cleaner at 3 m <br />60 Conversation at 1 m <br />Urban Residence <br />40 <br />Soft Whisper at 2 m <br />20 North rim of Grand Canyon <br />0 Threshold of Hearing <br />