[from the full abstract] The year was also distinguished by the second smallest Antarctic ozone hole observed since 1988.
A.T.J. de Laat
. Stratospheric ozone [in "State of the Climate in 2016"]
Journal: Bulletin of the American Meteorological Society, Volume: Volume 99: Issue 8, Year: 2017, First page: S1, Last page: S310, doi: 10.1175/2017BAMSStateoftheClimate.1