During the southern hemisphere winter, a large hole appears in the ozone layer over the Antarctic continent. Why does this still happen, when the CFCs responsible were banned in the 1970s?

This animated visualisation, with audio commentary from an atmospheric  climate scientist, explains the processes behind how and why this happens, what has and is being done about it.

Produced for EUMETSAT, as part of their outreach activities in relation to the European Commission’s Copernicus earth observation initiative.