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The rise in the amount of Chlorine measured in the stratosphere over the past two decades matches the rise in the amount of _______.

A Fluorine

CFCs & HCFCs molecules contain Chlorine & Fluorine atoms. When these interact with Sun’s UV radiation, chlorine ion is separated from the CFC or HCFC molecule. Therefore, the amount of chlorine formed can be determined by the presence of fluorine in the Stratosphere.

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