Know your O3—NASA reports that the ozone hole over Antartica is in the midst of its annual size increase. Remember that ‘hole’ is a metaphor here. There’s still ozone there, just much less than historical values. So far this year, the hole seems to be smaller than the average from 1979-2009, likely due to warmer stratosphere temperatures in the southern hemisphere.
September 16th was the International day for the Preservation of the Ozone Layer. Better late than never, right?