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   further  reductions  in  emissions  of  carbon  monoxide  and  the

   maximum reductions  in such emissions  achievable from model  year

   2001  and later  model  year  light-duty vehicles  and  light-duty

   trucks when operated at 20 degrees Fahrenheit.

      "(B)(i) If  as of June 1,  1997, 6 or  more nonattainment areas

   have  a carbon  monoxide design value  of 9.5 ppm  or greater, the

   regulations under subsection (a)(1) of this  section applicable to

   emissions of carbon  monoxide from model year 2002 and later model

   year  light-duty  vehicles  and  light-duty trucks  shall  contain

   standards which  provide that  emissions of  carbon monoxide  from

   such vehicles and trucks  when operated  at 20 degrees  Fahrenheit

   may not exceed 3.4 grams per mile (gpm) in  the case of light-duty

   vehicles and 4.4 grams  per mile (gpm)  in the case of  light-duty

   trucks up  to 6,000 GVWR and  a level comparable  in stringency in

   the case of light-duty trucks 6,000 GVWR and above.

      "(ii) In determining for  purposes of this subparagraph whether

   6 or more  nonattainment areas have a carbon monoxide design value

   of 9.5 ppm or greater,  the Administrator shall exclude  the areas

   of Steubenville, Ohio, and Oshkosh, Wisconsin.

      "(3)  Useful-life for  phase i and  phase ii  standards.-In the

   case of  the standards referred to in paragraphs  (1) and (2), for

   purposes of certification under section 206 and in-use com-

   pliance  under section  207,  the  applicable useful  life  period

   shall be 5 years or  50,000 miles, whichever first  occurs, except

   that the Administrator  may extend  such useful  life period  (for

   purposes  of  section   206,  or  section  207,  or  both)  if  he

   determines that  it is feasible  for vehicles and engines  subject

   to  such standards  to  meet such  standards  for a  longer useful

   life. If the Administrator  extends such  useful life period,  the

   Administrator  may make  an  appropriate adjustment  of applicable

   standards for such  extended useful life. No such  extended useful

   life  shall  extend beyond  the  useful  life period  provided  in

   regulations under subsection (d).

      "(4) Heavy-duty  vehicles  and engines.-The  Administrator  may

   also promulgate regulations under subsection (a)(1) applicable  to

   emissions of carbon monoxide from heavy-duty  vehicles and engines

   when operated at cold temperatures.".  

SEC. 205. EVAPORATIVE EMISSIONS.  

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

adding the following new subsection after subsection (j):

   "(k)  Control of  Evaporative  Emissions.-The  Administrator shall

promulgate (and  from time to  time revise) regulations  applicable to

evaporativeemissionsofhydrocarbonsfromallgasoline-fueledmotorvehicles-

      "(1) during operation; and

      "(2) over 2 or more days of nonuse;

under ozone-prone summertime conditions (as  determined by regulations

of  the   Administrator).  The   regulations  shall  take   effect  as

expeditiously as  possible and  shall require  the greatest  degree of

emission  reduction  achievable by  means  reasonably  expected to  be

available   for  production  during  any  model   year  to  which  the

regulations   apply,   giving   appropriate   consideration   to  fuel

volatility, and to  cost, energy, and  safety factors associated  with

the application of the appropriate technology. The Administrator shall

commence a rulemaking under this subsection within 12 months after the

date  of the  enactment of the  Clean Air  Act Amendments  of 1990. If

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