NoiseEffect

To Health

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Prepared by Khen Samrith

Be carful about noise effect , Please take care your ear at your work

Prepared by Khen Samrith

Protection

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Sound level of airborne sound source

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Individual sensation of sound

Physical fitnessTired or side person feel more disturbed than well –rested or

healthy person

Time sequenceIncreasing and decreasing sounds are more disturbing

than monotonous ones

DurationThe longer a sound lasts , the more disturbing it becomes

Sound pressureThe stronger the sound pressure

, the more disturbing

FrequencyThe higher the frequency the

more disturbing is the sound this is true for sound up to 6000 cps.

Kind of activityIntellectual work is more easily disturbed than physical work

Personal attitude Those who hear involuntarily feel more

disturbed than those who make the noise

Noise Individual

sensation of sound

Prepared by Khen Samrith

Exposure to loud noise will inevitably cause hearing lossover time.

Loud noise damages or destroys the nerves in the inner ear.Another effect can be “tinnitus” or permanent ringing in the ear.

raised blood pressure increased heart rate and stress

resulting in irritability and headaches, an reduced ability to hear malfunctioning equipment, alarm signals or verbal warnings.

including the risks of stroke and heart attack

reduced immune response, and gastric ulcers.

Prepared by Khen Samrith

Prepared by Khen Samrith

Stress related symptoms include: irritability, headaches, moodiness and insomnia, and

disturbance of psychomotor reactions. Exposure to both excessive or low levels of noise can

result in: increased absenteeism reduced productivity due to fatigue and low

concentration increased production costs reduced quality of work/product/service, and reduced ability to communicate, for example,

difficulty in holding a telephone conversation.

When is Noise Too Loud? Noise is measured in units called“decibels” or “dB” If two people 3 feet apart must shout to be heard, the background noise is too loud (above 85

decibels). Noise above 140 decibels causes pain and immediate

hearing loss.

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Long Term Exposure to Noise Our ears can recover from short exposure to loud

noise, but over time nerve damage will occur. The longer and louder the noise, the greater

chance permanent damage will occur. There is really no such thing as “tough ears” or

“getting used to it”.

Prepared by Khen Samrith

Prepared by Khen Samrith

The table below shows noise levels and how long a person can be exposed without hearing protection before there is damage to the ear.

Noise Level Allowable Exposure Time◦85 decibels 8 hours◦90 decibels 4 hours◦100 decibels 1 hour◦105 decibels 30 minutes◦110 decibels 15 minutes◦115 decibels 0 minutes

Daily Allowable Exposure Times to Noise

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Equipment Noise Level

Back Hoe 85-95 decibels Chain Saw 110 decibels Front-end Loader 90-95 decibels Examples of Noisy Equipment Front 90 Gunshot 140 decibels Jackhammer 112 decibels Lawn Mower 90 decibels Tractor 95-105 decibels Circular Saw 90-100 decibels

Prepared by Khen Samrith

Picture of a damaged sheep lung

Non-Auditory Injuries

Healthy Damaged