The Ozone layer2

The decrease was later found due to the presence of CFC. It was then used as refrigant, aerosals and thermal insultions. Being chemically unreactive they would pass through the troposphere to the stratosphere where the UV light causes them to break forming chlorine oxide. Satellites detected that the ozone layer were eaten away due to the presence of chlorine oxide.

Guess that is why CFC usage was ban.

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