The ozone layer, is the blanket stratosphere, which by absorbing high-energy solar ultraviolet radiation protects all organisms on Earth. Used typically in aerosols, refrigerants and foam blowing-agents, they can remain active in the atmosphere for over a 100 years.
Skin cancers are the result of thinning ozone.
International policy saw formidable reductions in the global annual production of such substances and significantly reduced emissions. Recovery of the ozone layer is expected to lag significantly behind the introduction of remedial policies and this makes progress difficult to view. It could then be another 70 years before the ozone layer recovers, and so no significant differences could have been expected in the brief time since global and European Assessments are being made. Hopefully depletion rates have remained constant given the progress when banning CFCs. At home in Clare.