Chlorofluorocarbons are compounds that were not appreciably present in the atmosphere before 1950 but which now have a significant role in catalyzing decomposition of stratospheric ozone.

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Chlorofluorocarbons (CFCs) were first introduced as refrigerants, solvents, and propellants in the 1930s, and their use increased significantly after World War II. It wasn't until the 1970s that the scientific community discovered their harmful effect on the ozone layer in the stratosphere.

Chlorofluorocarbons Are Compounds That Were Not Appreciably Present in the Atmosphere