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

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Chlorofluorocarbons (CFCs) were first developed in the early 1930s, but their production and use increased significantly after World War II. Studies in the 1970s and 1980s confirmed that CFCs were depleting the ozone layer in the stratosphere, leading to the signing of the Montreal Protocol in 1987 to phase out their use.

Chlorofluorocarbons Are Compounds That Were Not Appreciably Present in the Atmosphere