I think, at least in the West, acid rain and the smogs that used to cause respiratory diseases are less of a problem because of our response to it. We banned CFC aerosol propellants, forced companies to fit scrubbers into their chimneys, etc.

The story, at least on those issues seems to offer some hope.

I could be wrong of course.

Nope. Not according to the European Geosciences Union anyway, whoever they are.

http://www.atmos-chem-phys.net/7/3663/2007/acp-7-3663-2007.html