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Anyone living on a major road for a long time will notice their walls slightly yellowing from the smog of all the cars. Not nearly as drastic as all those old houses when everyone used to smoke indoors, but it’s not insignificant.
So I can totally see the same thing occurring on rock faces and stuff caused by major industrial emissions.
Seriously. With all the hate, now they’re just straight murdering people trying to show evidence of a crime.
Don’t talk to cops, people. Even as a witness, apparently. They’ll kill you for fun anyway.