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Scientists actually discovered the ozone hole over Antarctica before CFCs were produced. Is this true?

April 26, 2017actually Antarctica CFC hole ozone produced scientists

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Scientists actually discovered the ozone hole over Antarctica before CFCs were produced. Is this true?

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This common idea is not true. In 1956, before CFC’s were widely used, the now famous scientist, Dobson, measured ozone over Antarctica and found about 20% less than he had expected. The levels he saw back then were 4-5 times more than what is measured in the ozone hole today.