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Ozone
Depletion???????
• What is the threat from
ozone depletion? Good
versus bad ozone.
• What causes ozone
depletion?
• ...
Ozone Depletion
What is ozone?
“Good” versus “bad”
ozone
Where is the “ozone
layer”
Keeps out about 95% of
UV rays
Layer h...
Ozone Depletion: What Causes Depletion?
GM Chemist discovered
Chlorofluorocarbons in
1930 (CFCs)
…also known as freon
• Ve...
Ozone Depletion: What Causes Depletion?
CFCs used for:
• Coolant in refrigerators
and air conditioners
• Propellant in aer...
Former Uses of CFCs
Air Conditioners
Refrigerators
Spray cans
Cleaners for electronic parts
Sterilizing medical instr...
Fig. 21-21 p. 484
CFCs are not the only
culprit
• Halons (fire
extinguishers)
• Hydrogen chloride
(space shuttle)
• Some natural
chemicals
Ozone “Hole”
During 4 months each
year half of the ozone
layer above Antarctica
is depleted
1984 researchers
discovered 40...
Skin Cancers
Fig. 21-25 p. 487
Ozone hole    threat to australia - roever  roby
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Ozone hole threat to australia - roever roby

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Pollution has become a day to day phenomenon in all dimensions of HUMAN LIFE and OZONE is no exception.

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Ozone hole threat to australia - roever roby

  1. 1. Ozone Depletion??????? • What is the threat from ozone depletion? Good versus bad ozone. • What causes ozone depletion? • What happens to ozone levels over Earth’s poles? • Why should we be worried about ozone depletion? • What are solutions to this problem? Save us!!!!
  2. 2. Ozone Depletion What is ozone? “Good” versus “bad” ozone Where is the “ozone layer” Keeps out about 95% of UV rays Layer has been thinning
  3. 3. Ozone Depletion: What Causes Depletion? GM Chemist discovered Chlorofluorocarbons in 1930 (CFCs) …also known as freon • Very stable • Nontoxic • Noncorrosive • Inexpensive “Dream Chemical”
  4. 4. Ozone Depletion: What Causes Depletion? CFCs used for: • Coolant in refrigerators and air conditioners • Propellant in aerosol sprays • Cleaner for electronics • Bubbles in plastic foams • Insulations
  5. 5. Former Uses of CFCs Air Conditioners Refrigerators Spray cans Cleaners for electronic parts Sterilizing medical instruments Fumigants for granaries and cargo ships
  6. 6. Fig. 21-21 p. 484
  7. 7. CFCs are not the only culprit • Halons (fire extinguishers) • Hydrogen chloride (space shuttle) • Some natural chemicals
  8. 8. Ozone “Hole” During 4 months each year half of the ozone layer above Antarctica is depleted 1984 researchers discovered 40-50% reductions in later winter (August – November)
  9. 9. Skin Cancers Fig. 21-25 p. 487

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