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To ConnClark,

thank you, for your interesting document. Albeit the flaw that this document is pretty old (2001) it seams, according your pdf, that DPF have a problem with nano-particles.

If, still today, this is the case then, IMHO, there remain only two approaches to correct this problem:
1. The fatalistic one: To accept this, but to inform the mainstream and press about this problem and thus make pressure to the automobile industry and law makers to resolve this dilemma with what so ever kind of technology ASAP.
2. The “hard way”: To forbid diesel cars until a solution is found. This approach, IMHO, isn’t feasible in Europe due to the importance that diesel cars have won.

I think that the PM is the main problem of the diesels and that any effort to reduce this is necessary.

IMHO, diesels are not the sole or definitive solution but a good alternative as long as we have no clean energy. Like nuclear / cold (?) fusion, high efficient solar energy etc. to produce “fuel” in form of hydrogen, electricity or what ever for cleans cars.