[Roanon]

Rextorres provided a link with specific information and explanation about why volcano eruptions do not interact with the ozon layer in a significant way. Fyron's links contained "informations" like "it is a well known fact that volcanic eruptions interact with the ozone layer..:" - I stopped reading there. A myth repeated by a lot of people does not become a "well known fact". Scientific essays on a similar level have begun with "it is a well known fact that the earth is flat and the center of the universe..."
But, as I said, someone clinging to his myth or believe will take this sentence as 100% scientific proof and will ignore anything else. This happens very often: people first make up their minds about what they want to believe, and then search for facts (or "facts") supporting it and ignore anything else. Unfortunately, some of them even publish a book (or an internet article) and claim knowing it all because they have done "extensive research"...
The scientific approach is to first collect as much facts as possible, check for possible faults and errors, and then make a theory. And if some facts do not fit into the theory, it is probably the theory and not the facts that are wrong. Therefore, I'm not saying "this and that causes the ozone hole and it will develop like this" - I'm just sure that a few volcanic eruptions within the Last years didn't cause anything like that. Volcanoes have erupted since the formation of the earth, more and heavier when earth was younger, and I'm too missing an explanation why they should cause significant ozone holes only in our century.