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   testing under this subparagraph.

      "(B) The  Administrator shall promulgate a  schedule phasing in

   any low-polluting  fuel requirement established  pursuant to  this

   paragraph  to  an   increasing  percentage  of  new   urban  buses

   purchased  or placed  into service  in each  of the  first 5 model

   years  commencing   3   years   after  the   determination   under

   subparagraph (A). Under  such schedule  100 percent  of new  urban

   buses  placed into  service in the  fifth model  year commencing 3

   years after the determination under subparagraph  (A) shall comply

   with the  low-polluting fuel requirement  established pursuant  to

   this paragraph.

      "(C)  The Administrator  may  extend the  requirements of  this

   paragraph   to  metropolitan  statistical  areas  or  consolidated

   metropolitan  statistical areas  with a  1980  population of  less

   than 750,000, if  the Administrator determines that  a significant

   benefit  to public  health could be  expected to  result from such

   extension.

   "(d) Retrofit  Requirements.-Not later  than 12  months after  the

enactment of the Clean  Air Act Amendments of 1990,  the Administrator

shall promulgate regulations under section 202(a) requiring that urban

buses which-

      "(1)  are operating in areas referred to in subparagraph (A) of

   subsection (c)(2)  (or subparagraph  (C) of  subsection (c)(2)  if

   the Administrator has taken action under that subparagraph);

      "(2)  were  not  subject  to  standards  in  effect  under  the

   regulations under subsection (a); and

      "(3) have  their engines replaced  or rebuilt after  January 1,

   1995,

shall  comply   with  an  emissions  standard   or  emissions  control

technology  requirement  established  by  the  Administrator  in  such

regulations. Such emissions standard  or emissions control  technology

re-

quirement shall  reflect the best retrofit  technology and maintenance

practices reasonably achievable.

   "(e)   Procedures   for   Administration   and    Enforcement.-The

Administrator shall establish, within 18 months after the enactment of

the Clean Air Act  Amendments to 1990, and in accordance  with section

206(h), procedures for the administration and enforcement of standards

for buses subject to standards under this section, testing procedures,

sampling  protocols,  in-use  compliance  requirements,  and  criteria

governing evaluation of buses.  Procedures for testing (including, but

not limited to, certification  testing) shall reflect actual operating

conditions.

   "(f) Definitions.-For purposes of this section-

      "(1)  Urban bus.-The term `urban  bus' has the meaning provided

   under regulations of  the Administrator promulgated under  section

   202(a).

      "(2)  Low-polluting fuel.-The  term `low-polluting  fuel' means

   methanol,  ethanol, propane,  or natural  gas,  or any  comparably

   low-polluting fuel.  In determining whether  a fuel is  comparably

   low-polluting, the Administrator shall consider both  the level of

   emissions of air pollutants from  vehicles using the fuel  and the

   contribution  of   such  emissions  to   ambient  levels  of   air

   pollutants. For  purposes of this  paragraph, the term  `methanol'

   includes  any fuel  which contains  at least  85 percent  methanol

   unless the  Administrator increases  such percentage  as he  deems

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