Agree in part, but note that tailpipes are only responsible for a small fraction of vehicular PM10 and PM2.5.[0] Tailpipes provide the greenhouse gases, but th

Agree in part, but note that tailpipes are only responsible for a small fraction of vehicular PM10 and PM2.5.[0] Tailpipes provide the greenhouse gases, but the EPA regs were about local pollution, which is driven by tire breakdown, road surface breakdown, brake pads, and overwhelmingly, an interesting process called "resuspension." Resuspension is related to vehicle weight, traffic flow patterns, and city road treatments. So agree the regs were "dumb," and agree we might want a pigouvian tax on underlying sources, but if we want to solve for local pollution, we also need some different set of regs that work on "total emissions" instead of "tailpipe emissions." [0] https://www.sciencedirect.com/science/article/pii/S135223101630187X https://www.sciencedirect.com/science/article/pii/S135223101...