The story so far The hole in the ozone layer is a result of human activities that have released ozone-depleting chemicals, including chlorofluorocarbons (CFCs) -- some of the first synthetic ...

chlorofluorocarbons, or CFCs—chemicals that were then used in refrigeration, air conditioning, insulation, and aerosol propellants. When CFCs drift up into the stratosphere, they can break down ...

From the mid-1970s, chemicals called chlorofluorocarbons (CFCs) — once widely used in aerosols and refrigerators — were found to be reducing ozone levels, creating annual holes largely over ...