CFCs, or chloroflourocarbons, are perhaps the most dangerous for the ozone, simply because (until about 20 years ago) they were being used so often.
A CFC is a chemical compund created in the 1930s that was used for refregeration uses. They are found in household items from refrigerators to spary cans. When the CFCs enter the atmosphere, the sun breaks down the compund and the chlorine part of the CFC breaks down the ozone hole. Even wrose, they stick wround in the atmosphere 20-100 years!
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