Transcript Maintaining Air Quality Agriscience Natural Resources Miss Anger Objective  Determine major sources of air pollution and identify how to improve air quality.

Maintaining Air Quality
Agriscience
Natural Resources
Miss Anger
Objective
 Determine
major sources
of air pollution
and identify
how to improve
air quality.
Air
 Colorless
 Odorless
 Tasteless
 Mixture
of gasses
 78% nitrogen, 21% oxygen, 1% other
gasses such as CO2, neon and helium.
Water
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Clear
Odorless
Tasteless
Colorless
Liquid
Chemical makeup is 2
parts oxygen to one
part hydrogen
Soil
The top layer of the Earths surface.
 Suitable for growth of plant life
 Made of broken down rocks and organic
components from the breakdown of plant
and animal life
 ORGANIC- Living materials or materials
that used to be living.
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Air Quality
Why is it important to have clean air?
(handout NR026 read, highlight and
answer test questions)
 What happens when air becomes polluted?
(handout NR027 read, highlight and
answer test questions)
 How does air become polluted?
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Effects of Air Pollution
Greenhouse effect
 Global warming
 What do we do about global warming?
(handout IS136 read, highlight and
answer test questions)
 Health issues- cancer
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Air
Air is necessary to life- 21%oxygen or the
brain will die in 4 to 6 min.
 Polluting the air in your neighborhood may
have effects in far away countries and not
your own. Why?
 We need to work together as a society to
reduce pollution.
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Major Threats to Air Quality
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Sulfur
Hydrocarbons
Nitrous Oxides and Lead
Carbon Monoxide
Radon
Radioactive Dust
Chlorofluorocarbons (CFC’s)
Pesticides
Asbestos
Sulfur
A pale yellow element found in nature
 Found in coal and crude oil
 When oil/coal is burned in combines with
oxygen to form harmful gasses
 Gas combines with moisture in air to form
Sulfuric Acid which will kill plant life and
will corrode metals.
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Hydrocarbons
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A product of burning fuels- abundant due to
factories and motor vehicles
Emission controls in cars such as:
 Crankcase ventilation
 Air injection
 Engine refinements
 4 valves per cylinder
With out these things it would be hard to breathe
in major cities where there is a lot of “stop and
go” traffic
Nitrous Oxides and Lead
Come from automobile exhaust
 Most difficult to remove and most
expensive to remove
 Install catalytic converters
Lead has been removed from gasoline to
clean air
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Carbon Monoxide
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Can not be removed from
car exhaust with the
current technology.
Colorless, odorless,
poisonous.
Kills people in
automobiles that have
leaking systems or in areas
with poor ventilationvictim falls asleep then
dies.
reduce emissions by
keeping engines tuned.
Radon
Radioactive gas from disintegration of
Radium.
 Colorless and odorless.
 Moves up thru the soil and enters the
atmosphere
 Problems occur when building in these
areas~ fix by sealing cracks
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Chlorofluorocarbons ~~CFC’s
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A compound of chlorine,
fluorine, hydrogen &
carbon.
Used in aerosols and
cooling systems such as
refrigerators.
Generally very stable.
But when released into
atmosphere it can survive
for 100 years!!
The chlorine atoms destroy precious Ozone~ a
layer of gas that protects the earth from
harmful ultra violet rays.
 Therefore there have been increased numbers
of skin cancer and immune system damage.
 CFC’s have been replaced have since been
replaced with less damaging agents.
 1987** a historic conference was held; where
37 countries agreed to schedule cutbacks on
the use of CFC’s.
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Pesticides
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Pest- Living organism
that acts as a nuisance.
Pesticides control
pests by killing them.
Chemicals and H20 to
spray on plants.
Contain toxic
chemicals that can kill
many living things.
Asbestos
A heat and friction resistant material once
used in the clutch and break line of most
vehicles, insulation, ceiling panels and other
products.
 Fibers are VERY damaging to the lungs and
cause disease and death.
 National laws and codes to remove asbestos
from public places and general use.
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