Which country thinned ozone layer?

Answer 1

Various countries have thinned ozone layer. Australia, New Zealand etc are some of them.

Answer 2

There isn't one country solely responsible for thinning the ozone layer. The thinning of the ozone layer, particularly over Antarctica, was mainly due to the release of chlorofluorocarbons (CFCs) and other ozone-depleting substances into the atmosphere by multiple countries over several decades. International agreements like the Montreal Protocol have since been put in place to phase out the use of these harmful substances.