On 13/10/2017 02:10, StarDust wrote:

http://www.bbc.com/news/science-environment-41585552

I thought, this problem is solved?

Increased use of relatively short lived chemicals that can get chlorine
up into the ozone layer seems to be having a deleterious effect. They
were not regulated before because they were thought to be too reactive
to survive long enough in the atmosphere to get up there.

I suspect there are some places still making illicit CFCs too but
nothing on the scale that they used to be used.

--
Regards,
Martin Brown