It's .09 versus .24 for the US versus EU standards. It's not like manufacturers can't bring over diesels, VW sells plenty of diesels in CA w/ it's .07 NOx limit, it's that they don't think there's a market for them because most people in the US don't like diesel and the ones that do will probably buy VW since they've been the only one in the US to offer diesels consistently.
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