Perhaps you should move to California?
Just because old diesels pump out soot, doesn't mean new ones do too.
You should note that that only applies to heavy trucks. My 1982 300SD has only an EGR, which failed and started belching exhaust straight to the atmosphere under my hood, puking all over my intake manifold. When the turbo went south I replaced it with a unit from a 1985 300SD (which I rebuilt, down to regrinding the wastegate valve seat with an old valve) which has an EGR in the compressor housing. But my 1992 F250 7.3 has no emissions equipment whatsoever. It doesn't even have equipment to compensate for altitude and turbo boost pressure like the 300SD does (the "ALDA" aneroid boost compensator) and fuel delivery is entirely foot-based anywhere in between idle and max fuel, the only times it runs on the governor. Luckily the turbocharger is pretty much perfectly sized for this engine, so as long as I'm nice to it, I don't make much smoke.
Point is, plenty of crusty-ass diesels still wandering around California. Meanwhile, Federal standards for diesels have actually done a pretty good job of cleaning them up nationwide, heavy equipment aside. What California has done recently has really clamped down on some of the stinkiest vehicles in neighborhoods but hasn't done so much to curb emissions from interstate trucks. No-idling laws (which in their day motivated the purchase of many expensive heat-pump/generator APUs) may have been fairly effective there, however. These new laws are eliminating school buses and light heavy duty trucks, some of which literally have the same engine as the heaviest diesel pickups from the Big Three, and with no less (and no more) emissions equipment.
Hopefully I either get out of California or get my truck trimmed up and sold before they go all-out and force DPF refits on light vehicles...