The area of the annually recurring Antarctic ozone hole reached its peak at 24.0 million square kilometers on 16 September according to data from NASA. This is more than in 2012 and 2010, but less than in 2011.
The World Meteorological Organization’s newest Antarctic Ozone Bulletin said the ozone hole area averaged over the ten last days of September was 20.9 million km2 (data from the Royal Netherlands Meteorological Institute, KMNI).
The ozone mass deficit averaged over the same period was 19.59 megatonnes. This is more than in 2010 and 2012 but less than in 2011.
As the temperatures rise after the southern hemisphere winter, the ozone depletion rate will slow down. It is still too early to give a definitive statement about the degree of ozone loss that will occur in 2013. Existing data indicates that this year’s ozone hole is larger than in 2012 and possibly also 2010, but smaller than the one of 2011.