Final Rule for Emergency Vehicle Rule - Selective Catalytic Reduction (SCR) Maintenance and Regulatory Flexibility for Nonroad Equipment
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This rule consists of three parts. First, the Environmental Protection Agency (EPA) is adopting minimum maintenance intervals for replenishment of consumable chemical reductant (commonly known as diesel exhaust fluid, or DEF) in connection with the use of selective catalytic reduction (SCR) technologies. Second, EPA is adopting provisions allowing manufacturers of nonroad engines to give operators the means to obtain short term relief from emission controls while operating in emergency situations, such as those where operation of a nonroad engine or equipment is needed to protect human life, and where obtaining short-term relief from emission controls enables such operation. Third, EPA is adopting minor revisions to the direct final rule for emergency vehicles that became effective August 7, 2012, in response to comments received on the parallel Notice of Proposed Rulemaking.
- Final Rule (PDF) (20 pp, 324 K, published August 8, 2014)
- Summary and Analysis of Comments (PDF) (34 pp, 274 K, EPA-420-R-14-001, published July 2014)
- EPA Sets Standards for Diesel Fluid Systems: Adopts Relief Measures for Nonroad Equipment (PDF)(3 pp, 147 K, EPA-420-F-14-017, published July 2014)