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My solution is to eliminate Californian emissions and have just one standard to meet.
I would like to note that my car was one of the first 3 passenger car models to have a DPF. They had a tendency to plug so bad the cars wouldn't run at all or even worse the back pressure and heat was enough to crack the heads. Some times the filter would give way and send chunks of it self through the turbo charger thus destroying the turbo.
The EPA made Mercedes Benz swap out plugged DPFs under a life time warranty because they were creating more pollution than they were preventing.
Eventually Mercedes convinced CARB and the EPA to allow them to install a filter that allowed more soot to pass through it so it would plug up as bad.
I have some doubts about the benefits of a DPF in general. Diesel particulate matter below a certain size is what threatens to cause lung cancer. A DPF traps large particles and burns or breaks them up until they are small enough to get through the filter. So what you end up with is more fine particles that threaten to cause cancer.
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