Most chlorofluorocarbons are released into the atmosphere through leakages from refrigerants and the use of aerosols. They have no notable natural sources. Chlorofluorocarbons are chemical compounds composed of carbon, fluorine and chlorine.
At the point of emission, CFCs are stable, nonflammable, nontoxic, odorless and colorless. However, they start breaking apart and releasing chlorine atoms the moment they reach the stratosphere. The highly reactive rouge chlorine atoms break down the ozone layer, which is responsible for preventing the harmful ultraviolet radiation of the sun from reaching the earth's surface.
Due to their known destructive properties, the production of CFCs was banned in 1995. They have been replaced by ozone-safe Hydrofluorocarbons.