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Valgrim
on Aug 13, 2020
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Air pollution is worse than we thought
Is there any salt mine or saltwater body nearby? The only places I've seen that kind of erosion is in places near the sea.
dredmorbius
on Aug 13, 2020
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Acid rain.
Industrial pollution largely from coal combustion.
https://en.wikipedia.org/wiki/Acid_rain
nitrogen
on Aug 13, 2020
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There could be corrosive chemicals in factory exhausts that behave similarly.
nemacol
on Aug 13, 2020
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No salt. It is/was from coke plant and steel mill.
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