around here coal is illegal for home heating, pittsburgh was known as
the smokey city

HeyBub:

You will have to just trust me on this:
There is a really, *really* good reason that Pittsburgh is renowned world
wide as the best place to get medical treatment for any lung disease.
North West Indiana around Gary and over into Chicago, IL could be a very
close 2nd place.

Particulate air pollution from "soft" coal is really nasty. Few
homeowners could afford the air scrubbers and filters to make coal
heating healthy for their own family or near neighbors.