I was absolutely fascinated by this story which appeared on The Register recently. If you haven’t read then go and read it. Nothing unusual in there you might think. Except that one of the quotes caught my attention… “This year’s ozone hole was less centred on the South Pole as in other years, which allowed it to mix with warmer air, reducing the growth of the hole because ozone is depleted at temperatures less than -78 degrees Celsius,”. Now I didn’t appreciate this fact. I assumed that ozone disappeared under all conditions. However, from the quote in the story it appears that ozone disappears faster when conditions are cold. Mix the cold air under the hole with slightly warmer air and the disappearance of ozone happens at a slower rate.