Industrial noise and
Hearing conservation
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WHAT IS NOISE
Simply stated… noise is any
unwanted sound.
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Ways to characterize of noise
FREQUENCY- perceived as pitch
INTENSITY- perceived as loudness
NATURE- steady-state vs. impulse
DURATION- length of time exposed
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Noise Induced Hearing Loss
Initially, exposure to noise causes a
loss of sensitivity to high frequency
(high pitch) sound.
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Noise Induced Hearing Loss
One can experience progressive
high frequency hearing loss and not
be aware of it until it becomes
severe.
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How can it happen
Acoustic trauma – one time exposure to
loud sound.
Daily exposures to moderately loud
sounds.
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Effects of noise on hearing
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When noise is scientifically defined to
be a hazard?
Duration of exposure
Repeated exposure
85dBA for steady-state noise
sources
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Proper Use of Hearing Protection
It takes just a few minutes of
unprotected exposure at noise
above 115 decibels to risk hearing
damage.
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Proper Use of Hearing Protection
Earplugs not well inserted into the ear
canal will not provide complete
protection.
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How do we know something is too loud?
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How do we know something is too loud?
If you have to raise your voice to be
heard by someone standing within 3 foot
(arm’s length) then the level is most
likely above the hazardous noise level.
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How do we know something is too loud?
Objectively measure loudness with
proper equipment
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Noise Levels Examples
Equipment Noise Level
Trimmer
Edger
Chain Saw
Jackhammer
92.0 decibels
94.5 decibels
110 decibels
112 decibels
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Annual Hearing Testing
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Annual Hearing Testing
Why do annually
Feedback BEFORE it becomes a
problem. not five years down the
road when it definitely is a
problem.
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Annual Hearing Testing
What is your score
Are you practicing good
hearing conservation or
aren’t you
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Noise reduction rating (nrr)
All hearing protection devices have
a Noise Reduction Rating (NRR)
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Fitting Technique
Noise muffs should seal around
the ear
Replace ear cushions when
cracked or worn
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