Control of Air Pollution From New Motor Vehicles: Announcement of Public Workshop for Heavy-Duty Diesel Engines Employing Selective Catalyst Reduction Technology

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A public workshop is being held to discuss the operation of heavy-duty engines equipped with selective catalyst reduction (SCR). EPA will be reviewing its policies regarding the operation of SCR- equipped heavy-duty diesel engines without diesel exhaust fluid (DEF), with improper DEF, or when tampering (or some other defect in the SCR system) is detected.