CFCs were banned in many countries in the mid-1990s after it was found that they were breaking up the earth's ozone.
The ozone layer protects our planet from the sun's rays and is essential to life on Earth.
The southern continent of Antarctica has suffered the most damage from CFCs. At its largest the hole was about three times the size of Australia.
Scientists think the fact that the ozone layer now appears to be recovering is a great achievement and shows that countries working together can produce great results.