150 Firecracker 120 Ambulance siren 110 Chain saw, Rock concert 105 Personal stereo system at maximum level 100 Wood shop, Snowmobile 95 Motorcycle 90 Power mower 85 Heavy city traffic 60 Normal conversation 40 Refrigerator humming 30 Whispered voice Protect Your Ears: Know which noises can cause damage. Wear ear plugs when you are involved [...]