104 STAT. 2478 PUBLIC LAW 101-549—NOV. 15, 1990 "(ii) the technology for meeting more stringent emission standards will be available, as provided in paragraph (2)(A)(i), in the case of light-duty vehicles and light-duty trucks with a loaded vehicle weight (LVW) of 3,750 lbs. or less, for model years commencing not earlier than January 1, 2003, and not later than model year 2006, considering the factors listed in paragraph (2)(A)(i); and "(iii) obtaining further reductions in emissions from such vehicles will be needed and cost effective, taking into consideration alternatives as provided in paragraph (2)(A)(ii), the Administrator shall either promulgate the standards (and useful life periods) set forth in Table 3 in paragraph (1) or promulgate alternative standards (and useful life periods) which are more stringent than those referred to in subsections (g) and (h). Any such standards (or useful life periods) promulgated by the Administrator shall take effect with respect to any such vehicles or engines no earlier than the model year 2003 but not later than model year 2006, as determined by the Administrator in the rule. "(D) Nothing in this paragraph shall be construed by the Administrator or by a court as a presumption that any standards (or useful life period) set forth in Table 3 shall be promulgated in the rulemaking required under this paragraph. The action required of the Administrator in accordance with this paragraph shall be treated as a nondiscretionary duty for purposes of section 304(a)(2) (relating to citizen suits). "(E) Unless the Administrator determines not to promulgate more stringent standards as provided in subparagraph (B) or to postpone the effective date of standards referred to in Table 3 in paragraph (1) or to establish alternative standards as provided in subparagraph (C), effective with respect to model years commencing after January 1, 2003, the regulations under subsection (a) applicable to emissions of nonmethane hydrocarbons (NMHC), oxides of nitrogen (NO,), and carbon monoxide (CO) from motor vehicles and motor vehicle engines in the classes specified in Table 3 in paragraph (1) above shall contain standards which provide that emissions may not exceed the pending emission levels specified in Table 3 in paragraph (1).". 0)) USEFUL LIFE.— Section 202(d) of the Clean Air Act (42 U.S.C. 7521(d)(l)) is amended as follows: (1) Insert "except where a different useful life period is specified in this title" after "provide that". (2) Strike the semicolon at the end of paragraph (1) and insert the following ", except that in the case of any requirement of this section which first becomes applicable sifter the enactment of the Clean Air Act Amendments of 1990 where the useful life period is not otherwise specified for such vehicles and engines, the period shall be 10 years or 100,000 miles (or the equivalent), whichever first occurs, with testing for purposes of in-use compliance under section 207 up to (but not beyond) 7 years or 75,000 miles (or the equivalent), whichever first occurs;". (3) Insert "and light-duty trucks up to 3,750 lbs. LVW and up to 6,000 lbs. GVWR:' after "engines" in paragraph (1). (c) REVISED STANDARDS. —Subparagraph (C) of section 202(b)(l) of the Clean Air Act (42 U.S.C. 7521(b)(l)(C)) is amended to read as follows: "(C) The Administrator may promulgate regulations under subsection (a)(1) revising any standard prescribed or previously revised under this subsection, as needed to protect public health or welfare.
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