Comment by gsf_emergency

Hypothetical you ask for?

https://pmc.ncbi.nlm.nih.gov/articles/PMC1757501/

To preempt accusations that the automotive endproduct isn't represented by this study, I'll concede it's next to impossible to have conclusive studies on specific forms of road pollution, that is, the best one can do is find a link between (rail)cars and cancer but nothing more specific than that :)

--Until they replace rubber in wheels with something else, I guess. Meanwhile, feel free to accept the reindustrialization