following script can be used to deliver a 15-minute training
session to employees. You may wish to have some acoustical
ear muffs and ear plugs on hand to demonstrate personal protective
The text emphasizes important points related to hearing loss prevention. It is suggested that you try to stay strictly on topic. Obviously, you will need to be prepared to answer questions.
aware of the hazard
Farmers typically have greater hearing loss than people in other occupations. This is likely due to frequent and continuous exposure to loud noise produced by farm equipment, a barn full of squealing pigs, etc.
How is your hearing? Is it is good as it was a year ago? A decline in the ability to hear is less obvious than losses of other senses. It occurs slowly, usually over a number of years. You may not even realize that your hearing is gradually decreasing, because there is no pain. Often, people who have experienced considerable hearing loss will tend to speak loudly.
Sound and noise
Sound is measured in logarithmic units of sound pressure, called decibels. Values range from zero to 140. The bottom end of the scale represents the acute threshold of human hearing. The noise level inside an acoustically insulated tractor cab is usually about 85 decibels. A shot gun blast produces 140 decibels of sound pressure energy.
Noise is defined as unwanted sound. Loud noises increase heart rate and energy use. This can contribute to fatigue, discomfort, and mental ease.
However, the primary effect of noise is loss of hearing. Abusing the ears with loud noises shifts the hearing threshold upward, so that a person can only hear louder sounds.
You might have experience this after working in a noisy environment for several hours. When you stop, your ears may ring, and your hearing doesn't seem normal. Hearing will usually return to normal overnight. However, repeated exposure to excessively loud noises will eventually result in permanent hearing loss.
When noise exposure goes down, people often
The information and recommendations contained in this publication
are believed to be reliable and representative of contemporary
expert opinion on the subject material. The Farm Safety Association
Inc. does not guarantee absolute accuracy or sufficiency of
subject material, nor can it accept responsibility for health
and safety recommendations that may have been omitted due
to particular and exceptional conditions and circumstances.
Copyright © 2002
Copyright © 2002 Farm Safety Association Inc.
22-340 Woodlawn Road West, Guelph, Ontario N1H 7K6 (519) 823-5600.
Disclaimer and Reproduction Information: Information in NASD does not represent NIOSH policy. Information included in NASD appears by permission of the author and/or copyright holder. More