Hearing conservation
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Transcript of Hearing conservation
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Hearing ConservationSaving your hearing for the good things in life.
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The Basics Excessive sound can damage your
hearing, leading to tinnitus and hearing loss
Hearing loss is often permanent
Hearing loss is one of the most common occupational injuries in Manitoba.
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Inside the Ear
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Tinnitus Is a ringing, buzzing, or roaring sound in
the ear
Can be temporary or permanent
Usually accompanies hearing loss
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Types of Hearing Loss There are three main types of hearing
loss:
Presbycusis
Temporary Hearing Loss
Permanent Hearing Loss
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Presbycusis Presbycusis is a type of hearing loss that
occurs naturally as people age
As people age, hair cells in the cochlea slowly die off, resulting in permanent hearing loss
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Temporary Hearing Loss Occurs when a person loses some or all
of their ability to hear for a short time
Usually occurs when a person is exposed to loud noise for a short period of time, such as a rock concert
Is usually accompanied by tinnitus
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Permanent Hearing Loss Occurs when a person is exposed to
loud noise over a longer period of time
Hearing never returns
Usually accompanied by tinnitus
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Other things that cause hearing loss
Head injuries
Infections
Drugs, including some prescription drugs
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How Much Noise is Too Much? The American Environmental Protection
Agency recommends that people not be exposed to more than 75dBa of noise for more than 8 hours per day
Manitoba WSH Act says you should not be exposed to more than 90dBa for more than 8 hours per day
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Rule of Thumb A general rule of thumb is that if you
can’t carry on a normal conversation with someone who’s about 3’ or 1m from you, you need to be wearing hearing protection
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Other Effects of Too Much Noise
High Blood Pressure
Stress Headaches
Sleep Disorders
Anger – Flight or Fight Response
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Noise in Construction Most power tools produce over 90dBa of
noise when being used
Powder-actuated tools can produce over 140dBa
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How Long Can I Be Exposed? Manitoba considers it safe for workers to be
exposed to 90dBa for 8 hours
Every 3dBa increase in noise means twice the amount of sound and half the safe exposure time
So, at 93dBa, the maximum “safe” exposure time is 4 hours, and at 96dBa, it’s 2 hours
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Types of Hearing Protection
Two basic types of hearing protection are available for workers at BUILD:
Ear plugs
Ear muffs
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Ear Plugs Are the most common form of hearing
protector in the construction industry
Provide the best noise reduction rating
Are sometimes uncomfortable
Are sometimes annoying if you have to put them in and take them out a lot
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How to Fit Ear Plugs
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Ear Muffs Provide very good hearing protection,
but not quite as good as ear plugs
Can be worn by themselves or attached to your hard hat
Are more convenient if you only use them occasionally
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Ear Muffs
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Noise Reduction Rating All hearing protectors are labelled with a
Noise Reduction Rating, or NRR
The NRR is the amount of sound the hearing protector blocks
For example, 112dBa (noise) – 32dBa (NRR) = 80dBa (what you hear)
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NRR Label
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Audiometric Testing All construction workers in Manitoba
have to have their hearing tested
Within 70 days of being hired, and
Once a year afterwards
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Workers Compensation Yes, you can receive Workers’
Compensation benefits for hearing loss
Benefits are usually capped at the cost of 1 or 2 hearing aids
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So? You get to choose whether you wear
hearing protectors now, or hearing aids later in life.
Choose wisely