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      standards  which  reflect  the  greatest  degree  of   emission

      reduction  achievable through  the  application  of  technology

      which the Administrator

      determines will be available  for the model year to  which such

      standards  apply,  giving  appropriate consideration  to  cost,

      energy, and  safety factors associated with  the application of

      such technology.

         "(ii) In  establishing classes or  categories of vehicles or

      engines for  purposes of regulations under  this paragraph, the

      Administrator  may base  such  classes or  categories on  gross

      vehicle  weight,  horsepower,  type  of  fuel  used,  or  other

      appropriate factors.

         "(B)  Revised standards  for heavy  duty trucks.-(i)  On the

      basis of information available to  the Administrator concerning

      the effects of air  pollutants emitted from heavy-duty vehicles

      or  engines and  from other  sources  of mobile  source related

      pollutants on the  public health and welfare,  and taking costs

      into  account,  the  Administrator  may  promulgate regulations

      under paragraph  (1) of  this subsection revising  any standard

      promulgated  under, or before the date of, the enactment of the

      Clean Air Act  Amendments of 1990 (or  previously revised under

      this subparagraph)  and applicable to classes  or categories of

      heavy-duty vehicles or engines.

         "(ii) Effective for the model year 1998 and thereafter,  the

      regulations under  paragraph (1) of  this subsection applicable

      to  emissions of  oxides of  nitrogen (NOx)  from  gasoline and

      diesel-fueled heavy duty  trucks shall contain  standards which

      provide  that such emissions may not exceed 4.0 grams per brake

      horsepower hour (gbh).

         "(C)  Lead time and  stability.-Any standard  promulgated or

      revised  under  this paragraph  and  applicable  to classes  or

      categories of heavy-duty vehicles or engines shall apply  for a

      period of  no less than 3 model years beginning no earlier than

      the  model year commencing 4  years after such revised standard

      is promulgated.

         "(D) Rebuilding practices.-The Administrator shall study the

      practice  of  rebuilding  heavy-duty  engines  and  the  impact

      rebuilding  has on engine emissions. On the basis of that study

      and  other  information  available  to  the  Administrator, the

      Administrator  may prescribe requirements to control rebuilding

      practices, including standards applicable to emissions from any

      rebuilt heavy-duty engines  (whether or not the engine  is past

      its  statutory  useful  life),  which  in  the  Administrator's

      judgment  cause,  or contribute  to,  air  pollution which  may

      reasonably be anticipated to  endanger public health or welfare

      taking  costs into  account. Any  regulation shall  take effect

      after a  period the Administrator finds necessary to permit the

      development  and application of the requisite control measures,

      giving  appropriate  consideration to  the  cost  of compliance

      within the period and energy and safety factors.".

         (2)  Redesignate subparagraph  (F) as  subparagraph  (E) and

         insert   "Motorcycles.-"  before   "For  purposes   of  this

         paragraph".

SEC. 202. CONTROL OF VEHICLE REFUELING EMISSIONS.  

   Section 202(a)(6) of the Clean  Air Act (42 U.S.C.  7521(a)(6)) is

amended to read as follows:  

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