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that anyone hanging laundry (particularly whites like sheets) would result in them all gray from the soot.
Over here on the other side of the state, back in the early part of the 20th Century, the Schuylkill River looked like this (1913) -
(from here - https://slought.org/resources/redemption_of_schuylkill)
And now the same area by the Fairmount Water Works today 2018) -
I have been on the Duquesne incline where you can see that picturesque view of Pittsburgh. 
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