Improvements for Heavy-Duty Engine
and VehicleTest Procedures, and other
Technical Amendments: Final Rule
t I Hiis final action amends the regulations that implement EPA's air
JL pollutant emission standards for engines, vehicles and equipment.
The amendments include corrections, clarifications, and flexibilities that
do not raise significant policy issues.
a;	T ie majority of the amendments in this final action modify test procedures for heavy-
duty highway engines and vehicles to improve accuracy, and in some cases, reduce test
C	burden. They mainly apply to measurement of greenhouse gas pollutants (primarily
CO,), though some apply to criteria pollutants (such as NOx) as well.
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Which Products would be Affected?
The amendments affect the emission certification of the following products:
•	Light-duty vehicles
•	Heavy-duty vehicles and engines
•	Motorcycles (highway and nonroad)
•	Marine engines
•	Locomotives
•	Other nonroad engines and equipment
•	Stationary engines
•	Portable fuel containers
Who would be Affected by these Changes?
The changes would primarily affect manufacturers seeking certification of any of the affected
products, including importers and secondary manufacturers. The changes to the emission test
procedures would also affect anyone performing certification testing, such as independent test
laboratories. Other persons such as distributors and end-users may be indirectly affected by the
amendments.
For More Information
You can access the rule and related documents on EPA's Office of Transportation and Air
Quality (OTAQ) website at:
www.epa.gov/regulations-emissions-vehicles-and-engines/final-rule-improvements-
heavy-duty-engine-and-vehicle.
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