Definition of tier 2 emission standards
In this section, the term “tier 2 emission standards” means the motor vehicle emission standards that apply to passenger cars, light trucks, and larger passenger vehicles manufactured after the 2003 model year, as issued on , by the Administrator of the Environmental Protection Agency under sections 7521 and 7545 of this title.
Diesel combustion and after-treatment technologies
The Secretary shall accelerate efforts to improve diesel combustion and after-treatment technologies for use in diesel fueled motor vehicles.
Goals
The Secretary shall carry out subsection (b) with a view toward achieving the following goals:
Developing and demonstrating diesel technologies that, not later than 2010, meet the following standards:
Tier 2 emission standards.
The heavy-duty emissions standards of 2007 that are applicable to heavy-duty vehicles under regulations issued by the Administrator of the Environmental Protection Agency as of .
Developing the next generation of low-emission, high efficiency diesel engine technologies, including homogeneous charge compression ignition technology.
Pub. L. 109–58, title VII, § 754119 Stat. 828 (, , .)