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The only significant increase to the air quality we'll ever see is if all diesel trucks are fitted with common-rail injection diesel engines with NOx filters that run on the new low-sulfur diesel.
As it stands now, the sulfur in the diesel fuel that is sold in North America works as a lubricant for these engines, and they are going to have some fun working around that.
Modern diesel tech is so much cleaner than gasoline, and it horrifies me that we aren't using it here. People hate diesels because of these trucks because those engines are smelly, dirty, and sound like a skeleton masturbating in a filing cabinet.
Result from paper towel pressed up against the exhaust of 2 running Mercedes E-Class cars, otherwise identical except for the fact that the black one is diesel and the silver one is gasoline. You can plainly see that with low-sulfur diesel fuel, proper filters and perhaps even urea-injection units installed in the engine (which we likely won't see, as it was a stop-gap measure in Europe), the diesel is immensely cleaner.

Here's what I'm pretty happy about, Mercedes' BLUETEC clean diesel tech. It'll be here soon.

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