The U.S. Supreme Court, in a recent unanimous decision, affirmed Environmental Protection Agency (EPA) right, as defined in the Clean Air Act, to establish environmental control mandates without regard for their cost. Apparently based on this principal, the U.S. EPA has developed, in cooperation with platinum group metals (PGM) catalyst suppliers, a dual heavy duty truck diesel emissions control system that may be a new level of cost and complexity. Engine-out exhaust initially is ...

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