Download - Noise and hearing los
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Indian Audio Centre,SCO 78-79, Sector 17 C, Above old Punjab & Sind
Bank,
\Chandigarh 160017
Sandeep kamboj)
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Noise and Hearing Loss
Basically, noise is unwanted sound.
It is a pollutant and a hazard to human health and hearing. In fact, it has been
described as the most pervasive pollutant
in America.
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Noise and Hearing Loss
•Noise in our environment affects physical health.
•Noise also has psychological and social implications and affects our well being and quality of life.
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Noise and Hearing Loss
• Unfortunately, public awareness of the hazardous effects of noise is low - especially noise considered to be non-occupational.
• Fourth Wednesday in April has been declared International Noise Awareness Day (INAD).
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Noise Levels
• Both the amount of noise and the length of time you are exposed to the noise determine its ability to damage your hearing.
• Noise levels are measured in decibels (dB). • The higher the decibel level, the louder the noise. • Sounds louder than 80 decibels are considered
potentially hazardous. • Continued exposure to more than 85 decibels (dBA) of
noise may cause gradual but permanent damage to hearing. Hearing loss is accelerated by louder noises.
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How noise damages hearing
• The amount of sound that is capable of producing subsequent hearing loss is related by so called damage risk criteria, which is based upon equal energy concept.
• Total Sound energy delivered to the cochlea, i.e. relevant in predicting injury and hearing loss
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How much noise exposure is allowed
•90 db for 8 hours.•95 db for 4 hours.
•115 db for 15 minutes.
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Noise induced hearing loss.
• The majority of noise induced hearing loss occurs due to occupational or industrial exposure.
• Maximum loss is typically occur after 10 to 15 years of continues exposure
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The noise chart
Below gives an idea of average decibel levels for everyday sounds around you.
Painful:• 150 dB = rock music peak• 140 dB = firearms, air raid siren, jet engine• 130 dB = jackhammer• 120 dB = jet plane take-off, amplified rock
music at 4-6 ft., car stereo,• band practice
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The noise chart
Extremely loud:• 110 dB = rock music, model airplane• 106 dB = timpani and bass drum rolls• 100 dB = snowmobile, chain saw,
pneumatic drill• 90 dB = lawnmower, shop tools, truck
traffic, subway
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The noise chart
Very loud:• 80 dB = alarm clock, busy street• 70 dB = busy traffic, vacuum cleaner• 60 dB = conversation, dishwasher
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The noise chart
Moderate:• 50 dB = moderate rainfall• 40 dB = quiet room
Faint:• 30 dB = whisper, quiet library
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Warning Signs of Hazardous Noise
• You must raise your voice to be heard • You can't hear someone two feet
away from you • Speech around you sounds muffled or
dull after leaving a noise area • You have pain or ringing on your ears
(tinnitus) after exposure to noise.
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Hazardous Noise
• Sounds louder than 80 decibels are considered potentially dangerous.
• Both the amount of noise and the length of time of exposure determine the amount of damage.
• Hair cells of the inner ear and the hearing nerve can be damaged by an intense brief impulse, like an explosion, or by continuous and/or repeated exposure to noise.
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Examples of noise levels considered dangerous by experts
• a lawnmower, • a rock concert, • firearms, • firecrackers, • headset listening
systems,
• motorcycles, • tractors, • household
appliances (garbage disposals, blenders, food processors/choppers, etc.)
• and noisy toys.
All can deliver sound over 90 decibels and some up to 140 decibels.
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Can't my ears "adjust" and "get used" to regular noise?
• If you think you have "gotten used to" the noise you are routinely exposed to, then most likely you have already suffered damage and have acquired a permanent hearing loss.
• Don't be fooled by thinking your ears are "tough" or that you have the ability to "tune it out"!
• Noise induced hearing loss is usually gradual and painless, but, unfortunately, permanent.
• Once destroyed, the hearing nerve and its sensory nerve cells do not regenerate!
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Physical Changes
• The most notable physical effect of noise exposure is loss of hearing . Noise Induced Hearing Loss (NIHL) affects children, adolescents, young adults, and older adults.
• Because of noise in our society, hearing loss is appearing much earlier in life than would have been expected just 30 years ago.
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Noise affects hearing & other parts of the body and body systems .
It is now known that noise:
• Disturbs digestion• Increases blood pressure • Increases breathing rate • Can cause an upset stomach or ulcer • Has negative cardiovascular effects such as changing the way
the heart beats • Can negatively impact a developing fetus, perhaps
contributing to premature birth • Makes it difficult to sleep, even after the noise stops • Intensifies the effects of factors like drugs, alcohol, aging and
carbon monoxide
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Noise affects in other ways
• increase fatigue & cause irritability • effects of noise on behavior • makes speech communication harder
(More concentration and energy is needed not only to listen and hear over the noise but also to speak louder above the noise)
• voices can become strained and vocal cord abuses, such as laryngitis may develop.
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Noise affects in other ways
The most important effect of noise
in the totality of the effects on the human,
is
“PRODUCTIVITY”
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“5” phase hearing conservation program for industry:
1. Noise Monitoring 2. Audiometric (Hearing)
Testing 3. Employee Training 4. Hearing Protectors 5. Recordkeeping