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While I'm no fan of buses as opposed to rail... diesel engines and particle filters have come a long way since the smog-belching truck engines you're thinking of were designed. That black smoke is largely a solved problem, technically.

In the US, 2006-2012 is our timeline for cleaning up diesel road vehicles. By the end of this transition, we'll require advanced engine emission controls, diesel particulate filters, and ultra-low-sulfur diesel nationally - most of the requirements exist now in most states/cities, and fleet changeover is already happening. The requirements will be extended to all non-road diesel by 2016. We'll also be switching to more and more biodiesel over time, which is essentially free of most diesel pollutants.

This is what the EPA got up to for the eight years it was politically constrained from addressing most environmental topics.

by Squalish on Oct 25, 2009 2:52 pm • linkreport

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