Wait a minute! What was that last part? ...except in 2015... it was largest... because volcano?
And by the way, if less ozone created more clouds at lower temperatures over the polar region, did it cause global warming or global cooling? Have we found a way to combat global warming here?
I find no credibility in this piece.
Most folks would think that a “hole” is a lack of something, but in this case it is a thinning of the ozone. A true graphic with a scale -
A good detailed description here -