For some background on ozone and depletion visit the site of the Australian Department of Sustainability, Environment, Water, Population and Communities – http://www.environment.gov.au/atmosphere/ozone/ozone.html – what
How is ozone destroyed? The Bureau of Meteorology has a good explanation.
How does ozone affect ultra violet radiation that can lead to skin damage? Have a look at question 4 in this link is to the United Nations Environment Programme Scientific Assessment panel site where they answer some of the FAQs –
What has been happening to the ozone hole? Here is a recent report form the Commonwealth Scientific and Industrial Research organization (CSIRO) – insert link to report I have given you
And here is another link to a great national Aeronautical and Space Administration (NASA) site about the the ozone hole and other interesting stuff –