Direct Final Rule for In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emission Measurement Accuracy Margins for Portable Emission Measurement Systems and Program Revisions
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Rule Summary
The U.S. Environmental Protection Agency (EPA) is publishing a Direct Final Rule to adopt final accuracy measurement margins for testing gaseous pollutants with portable emission measurement systems. Also, the rule makes several changes to the program in the early years of in-use testing. First, for particulate emissions (PM), this rule eliminates the first calendar year, i.e., 2006, of the two-year pilot program. Second, due to a delay in developing the final accuracy margin for PM, we are delaying the first year of the fully enforceable PM test program from the 2008 calendar year to the 2009 calendar year. During the 2008 calendar year, we are adding another year of pilot program for that pollutant. Third, and finally, we are extending the normal period for reporting in-test results during the initial years of the program and allowing certain short-term changes in how vehicles are recruited and tested.
- Direct Final Rule: In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emission Measurement Accuracy Margins for Portable Emission Measurement Systems and Program Revisions (pdf) (194 KB, published March 13, 2008)
- Technical Support Document: Additional Analyses of the Monte Carlo Model Developed for the Determination of PEMS Measurement Allowances for Gaseous Emissions Regulated Under the Heavy-Duty Diesel Engine In-Use Testing Program (pdf) (781 KB, EPA-420-R-07-010, August 2007)
Additional Resources
Fact Sheets
- Amendments to the Manufacturer-Run, Heavy-Duty Diesel In-Use Engine and Vehicle Testing Program (pdf) (94.4 KB, EPA-420-F-08-011, February 2008)
Other
- Revised Final Report: Determination of PEMS Measurement Allowances for Gaseous Emissions Regulated Under the Heavy-Duty Diesel Engine In-Use Testing Program (pdf) (7.6 MB, EPA420-R-08-005, February 2008)