The simple answer is that there is evidence that it is on the mend. You will need to read the link tho, because the influences to the hole are convoluted. There is no doubt that chlorine and bromine are contributors, but then so are variables such as especially cold temperature and atmospheric flow patterns. The hole size should tend to vary a bit, but with a long term downward trend as Cl slowly leaves the atmosphere.
larry
I believe the answer is 'No but it hasn't got worse'. A distinct drop in the graph has been halted but It could take 25 years to get 'fixed', as some CFC's are still being illegally and accidently released.
Some people will disagree but in my opinion it was an essential course of action. It was a great display of common sense and co-operation. The consequences of doing nothing were potentially very bad.
