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Noise and Vibration How the Ear Works Causes of Hearing Loss • Hair cells stop sending signals to the brain • Chronic exposure • One-time exposure Noise Induced Hearing Loss • Hearing loss from exposure to sound • Time • Sound intensity Sound • Measured in decibels (dB) • Sounds over 85 decibels can cause hearing loss • Equipment with noise levels over 85 dB – – – – – Farm tractors Skid steers Chain saws Grain dryers Lawn mowers Intensity and Time • 85 decibels for eight hours • For each 5 dB increase in intensity, the exposure limit is cut in half • 90 dB – 4 hours • 95 dB – 2 hours • 110 dB – 15 minutes Protect Your Hearing 1. Eliminate the source of the noise (or turn it off) 2. Stay away from the noise source 3. Use personal protective equipment when you have to be near the noise source Help your hearing • Replace old or damaged mufflers Vibration • Equipment vibration passes to the operator • Can cause health problems like back aches, finger numbness and more Controlling Vibration • Keep machines tuned and running well • Replace old and worn out seats • Limit the amount of time of exposure to excessive vibration Summary • Noise and vibration are common hazards on farms • Too much noise can cause hearing loss • Excessive vibration can cause back pain and other health problems