Does this apply only to new cars? I recall that some states (CA and NY among them, I believe) did not allow new diesel passenger cars to be sold in their borders, but one could buy a "used" car and bring it in. IIRC the car had to have 12K miles on it to be considered "used."

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)