PUBLIC LAW 101-549—NOV. 15, 1990 104 STAT. 2483 other than those subject to standards under section 219 shall contain a standard which provides that emissions of particulate matter (PM) from such buses may not exceed the standards set forth in the following table: "PM STANDARD FOR BUSES 1991 1992 1993 and thereafter Model year Standard *. 0.25 0.25 0.10
- Standards are expressed in grams per brake horsepower hour (g/bhp/hr).
SEC. 208. MOTOR VEHICLE TESTING AND CERTIFICATION. (a) ADDITIONAL TESTING PROCEDURES. —Section 206(a) of the Clean Air Act (42 U.S.C. 7525(a)) is amended by adding the following after paragraph (3): "(4)(A) Not later than 12 months after the date of the enactment Regulations. of the Clean Air Act Amendments of 1990, the Administrator shall revise the regulations promulgated under this subsection to add test procedures capable of determining whether model year 1994 and later model year light-duty vehicles and light-duty trucks, when properly maintained and used, will pass the inspection methods and procedures established under section 207(b) for that model year, under conditions reasonably likely to be encountered in the conduct of inspection and maintenance programs, but which those programs cannot reasonably influence or control. The conditions shall include fuel characteristics, ambient temperature, and short (30 minutes or less) waiting periods before tests are conducted. The Administrator shall not grant a certificate of conformity under this subsection for any 1994 or later model year vehicle or engine that the Administrator concludes cannot pass the test procedures established under this paragraph. "(B) From time to time, the Administrator may revise the regulations promulgated under subparagraph (A), as the Administrator deems appropriate.". (b) PROJECTED SALES NOT EXCEEDING 300.— Section 206(a)(l) of the Clean Air Act (42 U.S.C. 7525(a)(l)) is amended by striking the third sentence and inserting the following: "In the case of any original equipment manufacturer (as defined by the Administrator in regulations promulgated before the date of the enactment of the Clean Air Act Amendments of 1990) of vehicles or vehicle engines whose projected sales in the United States for any model year (as determined by the Administrator) will not exceed 300, the Administrator shall not require, for purposes of determining compliance with regulations under section 202 for the useful life of the vehicle or engine, operation of any vehicle or engine manufactured during such model year for more than 5,000 miles or 160 hours, respectively, unless the Administrator, by regulation, prescribes otherwise. The Administrator shall apply any adjustment factors that the Administrator deems appropriate to assure that each vehicle or engine will comply during its useful life (as determined under section 202(d)) with the regulations prescribeid under section 202.". (c) FTP MODIFICATIONS. — Section 206 of the Clean Air Act is amended by adding the following new subsection at the end thereof:
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