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.
They are filled with Helium for a reason.
Freon is the only one that was banned, yet there are no studies cited that show how it is possible to get up to the level where the ozone is.
Every article on CFCs destroying ozone presumes the CFCs are already there. That is why the articles are Horse Pucky.