A few weeks ago, I attended a lecture presented by one of the scientists studying here on base. The lecture was about the hole in the Ozone over Antarctica. I learned, prior to that lecture, that the hole in the ozone above us is on average 1.5mm thick, and a normal thickness should be 5mm. What I didn't know before the lecture is that the hole only appears during a few months of the austral summer. Here are a few links if you're interested in reading more about it:
An article from the Antarctic Sun, written in 2003
theozonehole.com
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