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Originally Posted by 320touring
As for the USA-do the laws on emissions vary in every state? Are diesels more acceptable in some states than others?
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Yes and no. IIRC, standards for new vehicles are pretty much uniform, except for California. That's why you sometimes see mention of a car being a California or Federal/49-state model.
What varies are emission checks on vehicles. This varies not only by state, but by county/city within states. For instance, here in Nevada an annual smog inspection is required only if you live in the two (or maybe three) counties with substantial urban areas, but not in the rural counties.
Just FYI on diesel, happened to notice prices as I passed a local station today. Regular $3.19/gal, diesel $3.09. And saw a diesel pickup pulling out, ahead of a dense cloud of black smoke...