I think ozone depletion is not caused by man-made chemical compounds alone.Just like global warming, it has something to do with the natural changes in the atmosphere. Something like sunspot cycle may also contribute to flunctuation in ozone layer intensity. But they just may,and I am afraid that volcanic eruptions will by no means affect ozone layer on a large scale.
I am going to participate in the ozone quizz competition to be held in Bangkok. Hope to hear more about ozone .
