PUBLIC LAW 101-549—NOV. 15, 1990 104 STAT. 2505 SEC. 226. PROHIBITION ON PRODUCTION OF ENGINES REQUIRING LEADED GASOLINE. Part A of title II of the Clean Air Act is amended by adding the following new section after section 217: "SEC. 218. PROHIBITION ON PRODUCTION OF ENGINES REQUIRING 42 USC 7553. LEADED GASOLINE. "The Administrator shall promulgate regulations applicable to Regulations, motor vehicle engines and nonroad engines manufactured after model year 1992 that prohibit the manufacture, sale, or introduction into commerce of any engine that requires leaded gasoline.". SEC. 227. URBAN BUSES. Part A of title II of the Clean Air Act is amended by adding the following new section after section 218: 'SEC. 219. URBAN BUS STANDARDS. 42 USC 7554. "(a) STANDARDS FOR MODEL YEARS AFTER 1993.— Not later than Regulations. January 1, 1992, the Administrator shall promulgate regulations under section 202(a) applicable to urban buses for the model year 1994 and thereafter. Such standards shall be based on the best technology that can reasonably be anticipated to be available at the time such measures are to be implemented, taking costs, safety, energy, lead time, and other relevant factors into account. Such regulations shall require that such urban buses comply with the provisions of subsection (b) of this section (and subsection (c) of this subsection, if applicable) in addition to compliance with the standards applicable under section 202(a) for heavy-duty vehicles of the same type and model year. " (b) PM STANDARD. — "(1) 50 PERCENT REDUCTION.— The Standards under section 202(a) applicable to urban buses shall require that, effective for the model year 1994 and thereafter, emissions of particulate matter (PM) from urban buses shall not exceed 50 percent of the emissions of particulate matter (PM) allowed under the emission standard applicable under section 202(a) as of the date of the enactment of the Clean Air Act Amendments of 1990 for particulate matter (PM) in the case of heavy-duty diesel vehicles and engines manufactured in the model year 1994. "(2) REVISED REDUCTION. —The Administrator shall increase the level of emissions of particulate matter allowed under the standard referred to in paragraph (1) if the Administrator determines that the 50 percent reduction referred to in paragraph (1) is not technologically achievable, taking into account durability, costs, lead time, safety, and other relevant factors. The Administrator may not increase such level of emissions above 70 percent of the emissions of particulate matter (PM) allowed under the emission standard applicable under section 202(a) as of the date of the enactment of the Clean Air Act Amendments of 1990 for particulate matter (PM) in the case of heavy-duty diesel vehicles and engines manufactured in the model year 1994. "(3) DETERMINATION AS PART OF RULE, —As part of the rulemaking under subsection (a), the Administrator shall make a determination as to whether the 50 percent reduction referred to in paragraph (1) is technologically achievable, taking into
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