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OZONE and the ENVIRONMENT. Just what is Ozone?. Ozone is a form of oxygen with a different chemical property Ozone differs from oxygen: Has a distinctive odor Contains 3 oxygen atoms Absorbs damaging ultraviolet (UV) radiation In large concentrations ozone is hazardous. Earth’s Atmosphere.

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OZONE and the ENVIRONMENT


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just what is ozone
Just what is Ozone?
  • Ozone is a form of oxygen with a different chemical property
  • Ozone differs from oxygen:
    • Has a distinctive odor
    • Contains 3 oxygen atoms
    • Absorbs damaging ultraviolet (UV) radiation
  • In large concentrations ozone is hazardous
earth s atmosphere
Earth’s Atmosphere
  • Troposphere start on the surface and extends 5 – 9 miles
    • Air most dense
    • All weather occurs is this region
  • Stratosphereextends for 31 miles
    • Contains the Ozone layer
composition of the atmosphere
Composition of the Atmosphere
  • Nitrogen 78%
  • Oxygen 21%
  • Argon 1%
  • Water Vapor 0 – 7%
  • Ozone 0.01%
  • Carbon Dioxide 0.01 – 0.1%
ozone s primary function
Ozone’s Primary Function
  • Block or absorb most of the suns ultraviolet rays
  • Approx. 3,000 million tons of ozone in atmosphere
  • If concentrated at sea level, would measure only 3 mm thick
  • Depletion of this protective shield allows too much UV radiation to strike earth
measuring the ozone layer
Measuring the Ozone Layer
  • In 1920 Gordon Dobson began researching the ozone layer and its effects
  • Dobson Unit – Measures intensity of light passing through ozone layer thus measuring it’s density – 300DU is highest level of protection
destruction of the ozone layer
Destruction of the Ozone Layer
  • Ozone is both created and destroyed by the action of UV rays on oxygen molecules
  • Chlorine has been found to be major cause of ozone depletion.
  • UV rays react with chlorine and cause a chain reaction. One chlorine molecule can destroy 100,000 ozone molecules
chlorofluorocarbons cfc
Chlorofluorocarbons (CFC)
  • CFCs invented by Dupont, trade name Freon in 1928
  • Nonflammable, nontoxic, stable, non corrosive, odorless, low boiling point
  • Used as refrigerants, in manufacturing processes, as cleaning solvents, as propellants in aerosol cans
chlorofluorocarbons cfc1
Chlorofluorocarbons (CFC)
  • Throughout the 60’s & 70’s scientists learned that CFCs can stay airborne for decades. Taking as much as 8 – 10 years to reach the stratosphere
  • In the stratosphere CFCs are broken down by UV rays. Chlorine & fluorine molecules are released.
  • Millions of tons of CFCs are currently aloft in our atmosphere, it will take several hundred years for it all to be depleted.
the ban begins
The Ban Begins
  • In the late 70’s the U.S. Canada, Norway & Sweden banned CFCs in aerosol sprays
  • 1987 Montreal Protocol signed by 150 nations, phased reduction of annual CFC releases
  • CFC production totally banned as of Jan. 1996
  • If ban not in place, ozone depletion estimated to grow by .5% annually
  • Currently hole of the size of the U.S. Size and depletion percentage varies with seasonal changes
what does this mean for me
What does this mean for me?
  • Refrigerants used in Automobiles have changed, and may change again
  • Strict service procedures must be followed
  • Strict penalties for law breakers
  • Certification programs for technicians handling refrigerants