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Carbon halogen compounds are responsible.
The class I compounds which have high potential of destroying / reducing the ozone in the stratosphere are :  Carbon tetra chloride C Cl4,  Chlorons, Chloro  Fluoro Carbon  CFC,  methyl  Bromide, methyl chloroform.

These are used in industrial cooling or other purposes, refrigerators, and in air conditioning.

These gases are triggered by ultra violet rays and decompose and halogen radicals (like F, Br, Cl ions) are produced which reduce Ozone.

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