http://en.wikipedia.org/wiki/Acid_rain
Might be helpful, only read it briefly, too much science for my head. But mentions flue's for ridding coal fired plants of nasty sulphur. I remember most of Britains used to go to Scandanavia, but I guess Thatcher shutting down all the pits put a stop to that.
It still gets mentioned on news bulletins, mainly in relation to its damaging effects on old buildings; frequently Cathedrals. Hope it helps.
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