University of Pittsburgh, 1941 (prettymotherearth)
Once upon a time in the Steel City, there was so much smog in the air that it could block out the afternoon sun.  A British author even said it was "without exclusion may be the blackest location I ever saw."  Since that time there have been many laws and regulations that have caused the air quality to improve significantly.  Though we  aren't  quite at a "Happily Ever After" point in our air quality we can at least be safe knowing that we don't come home covered in soot!

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