And here it is, everything you ever wanted to know about ODSs (ozone depleting substances) but were afraid to ask.

CFCs

CFCs (chlorofluorocarbons or freons) are chemical compounds made up from carbon, fluorine and chlorine atoms. They used to be widely used, especially as coolants, propellants and cleaning solvents, but their use was prohibited by the Montreal Protocol (1989), as once in the atmosphere they contribute to destruction of the ozone layer.