EPA publishes an updated draft of its SCR guidance document

Christopher Goodfellow - 9 June 2011

The Environmental Protection Agency (EPA) has released an updated draft of its on-highway Selective Catalytic Reduction (SCR) certification guidance.

The document describes and seeks public comment on complying with adjustable parameter regulations which apply to the certification of on-high heavy-duty diesel engines.

It says: "This draft document provides specific examples of how we interpret existing certification regulations and how we intend to apply these regulations to heavy-duty diesel engines using SCR systems."

The document also mentions the "high dependency" of the successful implementation of SCR on the presence and quality of the reducing agent or Diesel Exhaust Fluid (DEF).

"Initially, DEF availability was concentrated around major truck routes, but has since increased in areas away from these locations. DEF is now available for sale in every state at truck stops and service facilities, and is available for delivery to fleet locations, as well," it notes.

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