If you've ever been stuck behind a big truck on a single-lane highway, you know that conventional diesel engines stink. But that exhaust is also health hazard. That's why California has strict rules on diesel engines. But a group of truckers and construction companies wants to loosen the rules. They're suing -- and any challenge to California rules has a ripple effect on other states.
Lawsuit Over Diesel Pollution Challenges California's Future Clean Air Authority
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