Environment Counts | Size of ozone hole over the Antarctica as large as nine years ago :
Intense ozone depletion over Antarctica occurs annually in the stratosphere at an altitude between 10 and 50 kilometers. The ozone hole reaches its maximum annual expansion during the spring months in the southern hemisphere and then decreases in the late spring. Over the past few years the ozone hole seemed to have stabilized. This year the ozone hole formed one month later and is now almost as large as it was nine years ago. The ozone hole currently extends over 26 million square kilometers. It is approximately 2.5 million square kilometers larger than at the same time in 2014.
The concentration of chlorofluorocarbons (CFCs) increases during the southern hemisphere winter. In the southern hemisphere spring sunlight causes these substances to react with ozone and decrease the concentration of ozone. The large size of the ozone hole and its delayed appearance was not expected by the atmospheric scientists at the German Aerospace Center (Deutsches Zentrum fÃ¼r Luft- und Raumfahrt; DLR) Earth Observation Center(EOC) who continuously monitor the stratospheric ozone layer. Source