Credit: Pittsburgh Post-Gazette
Streetlights were necessary at noon on October 29, 1948, when a heavy layer of smog descended on the city of Donora, south of Pittsburgh. The thick smog killed nearly 20 residents.
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Streetlights pierce a dense fog that is so thick, it looks like nightfall on a city street.
Credit: Pittsburgh Post-Gazette
Streetlights were necessary at noon on October 29, 1948, when a heavy layer of smog descended on the city of Donora, south of Pittsburgh. The thick smog killed nearly 20 residents.
