Chlorofluorocarbons (CFC-11 and CFC-12), they are also chemically inert in the troposphere, but they can also be photolyzed in the stratosphere by solar radiation or consumed by reaction with active oxygen atoms.
CCl₃F+hv→CCl₂F+Cl,
CCl₂F₂+hv→CClF₂+Cl
CCl₃F+O(1D)→CCl₂F+ClO
CCl₂F₂+O(1D)→CClF+ClO