Calif. agency orders heavy-duty diesel trucks to have soot traps on exhaust pipes

Monday, December 15, 2008 - 17:49 in Physics & Chemistry

California is snuffing out the last of the old stogies on the road. Against the backdrop of recession, the state's smog-fighting Air Resources Board on Friday ordered owners of all heavy-duty diesel trucks to install soot traps on exhaust pipes of older, high-polluting rigs or take them off the road, starting in 2011.

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