Embattled ozone layer hangs in there

The ozone layer over the Antarctic is usually the focus of environmental concern; it generally gets more damage than the Arctic ozone layer. But this winter, the ozone loss over the Arctic was at near-record levels. Fortunately, stratospheric winds transported ozone-rich air from earth's middle latitudes into the Arctic, replacing most of the lost ozone. As a result, only a small rise in ultraviolet radiation was observed at ground level. Link.