At the end of November extreme low values of total ozone content were observed over Europe. The values underwent the limit of 220 Dobson Units. As defined by UNEP, areas of such low values are called Ozone Holes. They are colored as violet in the following sequence of pictures. The Ozone Hole over Europe was present from Nov. 28th to Dec. 2nd.
Low Values occure over North America.
The Ozone Hole moves down to the Mediteranean Sea.