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CFC’s were used because in the troposphere they were completely unreactive and did not affect human health. This gave it a long atmospheric lifetime. What scientists did not realize is that the CFC’s were broken down by the UV radiation from the sun. (Dr. Elmar Uherek - Max Planck Institute for Chemistry, Mainz, Germany.)
The stratospheric ozone absorbs the ultra-violet radiation as a result it does not reach the troposphere. What this means is the ultra-violet (UV) light that reaches the earths surface is too weak to breakdown the CFC’s present. Significant amounts of CFC’s have entered the stratosphere and the ultra-violet radiation is strong enough to break the down into a reactive chlorine and fluorine, which is very capable of destroying the ozone...
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