The most harmful chemicals to the stratospheric ozone layer are chlorofluorocarbons (CFCs), which are considered greenhouse gases. CFCs were popular chemicals in the 1970s for aerosol propellants and the production of foams, and were used in old refrigerators and air conditioners.
When CFCs absorb solar radiation, they break down and emit chlorine atoms. It is those chlorine atoms that combine with ozone molecules and deplete the ozone layer. CFC use is most likely to blame for the increased levels of ozone depletion.
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