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Chloro Fluro Carbons deplete the ozone in the following chemical system.

CCl3F (Trichlorofluromethane, a common CFC)

UV radiation breaks the bond between one of the Chlorine atoms and the carbon

CCl3F + UV -> (CCl2F) + Cl

The Chloride ions in the Stratosphere cataylse the reaction between Oxygen and ozone.

Cl + O3 -> O2 + ClO

ClO + O -> O2 + Cl

The Chloride Ions will eventually be converted naturally into a chloride atom but It will aid in breaking down of hundereds of Ozone molecules before that happens.

Bromine (Br), Chlorine(Cl), Chlorine Monoxide (ClO), bromine Monoxide(BrO), Hydrogen Chloride (HCL), Hydrogen Bromide (HBr), Chlorine Nitrate (ClONO3), Bromine Nitrate (ClONO3)

Are all reactive Halon gases that will deplete ozone, such as the system above.

CFCs, ect are banned because they undergo chemical reactions that produce these reactive halon gases.

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Q: What is the processes that threatens the ozone layer?
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Ozone layer is caused by natural processes. It is formed by UV.


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Ozone layer is created by natural processes. UV and thunder are some of them.


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See "What is the depletion of the ozone layer?" in the "Related questions" section below.