CFC
Klorofluoroogljikovodiki (tudi freoni) s kemijsko formulo CFC so plini, ki povzročajo razgradnjo ozona, krivi so za tanjšanje plasti ozona v stratosferi, posledično povečanje ozonske luknje in s tem večje ultravijolično sevanje.
Te spojine je razvil ameriški izumitelj Thomas Midgley leta 1928. CFC-ji so zaradi nizke reaktivnosti uporabni kot potisni plin v sprejih in hladilni plin, zato so se je zelo hitro razširili. Šele kasneje so odkrili, da v višjih plasteh ozračja reagirajo z ozonom.
Danes izhlapevajo iz zavrženih hladilnikov in zmrzovalnikov na smetiščih.
Z Dunajsko konvencijo o zaščiti ozonske plasti so se države podpisnice, med katerimi je tudi Slovenija, zavezale za prenehanje uporabe ozonu škodljivih snovi, med katerimi so tudi CFC.
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