9. Workers washing the smog-blackened exterior of Allegheny Courthouse
14. Wabash Bridge (now demolished) and unidentified Downtown church during midday
15. Around the same time, St. Louis was also fighting to reduce air pollution
18. For more about pollution in that era, read about the Donora Smog, which killed 22 people and sickened more than 5,000 in 1948.
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