PITTSBURGH THE SMOKEY CITY

After my addendum to yesterdays post (in red) I decided to do a search and see what I could find.
The first is a digital collection from the University of Pittsburgh, entitled  SMOKE CONTROL LANTERN SLIDE COLLECTION  A few lines under the picture is a link that allows you to View Slides.  As you go to the collection, click on the individual photo and there will be a link entitled DESCRIPTION.   This will tell you about the photos.
The collection shows pictures from 1930 to 1940; you can see a diminished sun in some of the pictures that were taken during the day.
THE SMOKEY CITY 1945
PITTSBURGH HISTORY SERIES WQED
PITTSBURGH'S DARK HISTORY
PITTSBURGH SKYLINE TODAY