Freon is heavy like propane. It is liquid at -30 F so how does it get up there, and what keeps it from falling to lower altitudes?
The stratospheric turbosydes swirl them upward where the miniscule solid water vaporides make an ionic attraction capture. These super molecules then oxidize and attract the extra oxygen atom thus destroying the ozone layer.
Ot at least I think that is what is likely happening
Freon is not the only CFC. However, I do remember something to the effect that at least one of those chemicals actually settles rather than rises.