Answer:
CFCs
contain both chlorine and fluorine. CFCs are very stable and do not degraded by
any natural process. In the ozone layer present in the outer region of the
atmosphere (25-40 km above sea level), CFCs are dissociated by ultraviolet
light to release free chlorine atoms. Free chlorine atoms catalyse the
breakdown of ozone molecules (O3) into oxygen. This results in
degradation of the ozone layer. Thinning of the ozone layer would allow
penetration of ultraviolet light into Earth's atmosphere causing blindness,
skin cancer and mutations.
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