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EPA warms up to SCR

Published Tuesday, May 01, 2007

EPA has reconsidered its stance against selective catalytic reduction (SCR) as a viable technology for on-highway diesel engines to meet stringent 2010 emissions standards, and sent a letter to manufacturers outlining its intent to certify SCR engines. The letter outlines the criteria SCR-equipped vehicles must meet to obtain EPA certification. Much of the document addresses loopholes that end users could potentially exploit to operate vehicles while circumventing the emissions-related benefits. Specifically, the guidelines seek to ensure that SCR end users maintain the system's supply of reducing agent — typically urea — a consumable component of the emissions reduction ...

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