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Pittsburgh from the Salt Works at Saw Mill, by William T. Russell, 1843.
flipFlip to "Midday darkness": Smoke pollution in Pittsburgh, PA, circa 1940.
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Pittsburgh from the Salt Works at Saw Mill.

Credit: Courtesy of the Library and Archives Division, Historical Society of Western Pennsylvania, Pittsburgh, Pa.

In the early decades of the 1800s, Pittsburgh residents viewed the smoke that poured into the sky above their city as a sign of its economic promise and prosperity.

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