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CARB, the California Air Resources Board, enforces California air quality standards. 15 years ago, they set a timetable to ban older commercial diesel trucks when they implemented then clean diesel standards. The then-new standards were temporary and gave 15 years to meet much more rigorous future standards.
It gets much worse than that. I forget the details, but some years back there were entire fleets of new commercial diesel trucks that did not meet the CARB standards for clean diesel, and had to have their nearly new engines ripped out and replaced with CARB compliant engines.
Meanwhile, a full diesel ban is on the horizon.
Big change for big rigs: California unveils mandate to phase out diesel trucks