Chapter - 5 Power Point
Chapter - 5 Power Point
Chapter - 5 Power Point
READING ASSIGNMENT
5.2 AIR POLLUTION
Is an introduction of chemicals,
particular matter, or biological
materials that cause harm or
discomfort to humans or other livings
or cause damage to the natural
environment or built environment, in
to the atmosphere.
1/ Importance of Atmosphere
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5.4.NOISE POLLUTION
I /Sources
Uncontrolled Ground Motion- Anything that causes the
ground to move, other than your source, will generate
noise. These would include traffic traveling down a road,
running engines and equipment, and people walking.
Electronic Noise -anything that can cause changes in the
electrical signal in the cable or the recording system
causes noise in our recorded data.
Geological Noise -any type of subsurface geological
structure that we cannot easily interpret to be source of
noise.
Types and Sources…
ii/ Types of noise pollution
a/Broad band noise –acoustical energy distributed over a
broad range of wave lengths. E.g. noise produced by a
large crowd of people or railroad trains
b/Narrow band noise- acoustical energy distributed over a
narrow range of wavelengths & possessing a dominant
tone. E.g. jet engines and circular saws
c/Impulse or impact noise-acoustical energy distributed
over a short period of time. E.g. pneumatic jack hammer
& a punch press
d/White noise-broad band noise in which the power density
(acoustical power @ a particular freq) varies with time.
E.g. highway traffic noise
e/Pink noise-broad band noise in which the power densities
are equal.
4/Effects of Noise Pollution
ON HUMAN HEALTH
Hearing Problems :Noise levels above 80 decibels produce
damaging effects to the ear.
Cardiovascular Issues: A noisy environment can be a source
of heart related problems.
Sleep Disturbances: Noise can interrupt a good night's
sleep, and when this occurs, the person feels extremely
annoyed and uncomfortable.
Interference in Verbal Communication:
Mental Health Problems: Exposure to loud sound can lead
to elevated stress levels as well as stimulate violent behavior.
Effects of…
ON ANIMALS
Intolerable noise levels can decrease a cow’s
capacity of milk.
Affect egg production, cause stunted growth
in chickens
Noise of common ships create a problem on
communication of sea animals.
5/Control of Noise Pollution