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      requirements of subparagraph (A), the  Administrator shall make

      appropriate adjustments  to insure  that no credit  is provided

      for  improvement in  motor vehicle  emissions control  in motor

      vehicles sold after the calendar year 1990.

         "(C)    Compliance    determined    for    each    pollutant

      independently.-In determining  whether there is an  increase in

      emissions  in  violation   of  the  prohibition   contained  in

      subparagraph (A) the  Administrator shall consider an  increase

      in each air pollutant  referred to in clauses (i)  through (iv)

      as a separate  violation of such  prohibition, except that  the

      Administrator shall promulgate regulations  to provide that any

      increase  in emissions  of  oxides of  nitrogen resulting  from

      adding oxygenates to gasoline may be offset by an equivalent or

      greater reduction  (on a mass  basis) in emissions  of volatile

      organic compounds, carbon monoxide, or toxic air pollutants, or

      any combination of the foregoing.

         "(D) Compliance period.-The  Administrator shall  promulgate

      an  appropriate  compliance  period  or  appropriate compliance

      periods  to   be  used   for  assessing  compliance   with  the

      prohibition contained in subparagraph (A).

         "(E)   Baseline   for    determining   compliance.-If    the

      Administrator determines  that no  adequate and  reliable  data

      exists regarding the composition of gasoline sold or introduced

      into commerce  by a refiner,  blender, or importer  in calendar

      year  1990, for  such refiner,  blender, or  importer, baseline

      gasoline  shall  be  substituted  for  such  1990  gasoline  in

      determining compliance with subparagraph (A).

      "(9)   Emissions   from   entire   vehicle.-In   applying   the

   requirements  of  this subsection,  the  Administrator shall  take

   into account  emissions from the  entire motor vehicle,  including

   evaporative, running, refueling, and exhaust emissions.    "(10)

   Definitions.-For purposes of this subsection-

         "(A)  Baseline vehicles.-The  term `baseline  vehicles' mean

      representative model year 1990 vehicles.

         "(B) Baseline gasoline.-

           "(i) Summertime.-The  term  `baseline gasoline'  means  in

         the case of  gasoline sold during the high ozone  period (as

         defined  by the  Administrator) a  gasoline which  meets the

         following specifications:

                 "BASELINE GASOLINE FUEL PROPERTIES

API Gravity..................................................... 57.4

Sulfur, ppm..................................................... 339

Benzene, %...................................................... 1.53

RVP, psi........................................................ 8.7

Octane, R+M/2................................................... 87.3

IBP,  F......................................................... 91  

10%,  F......................................................... 128

50%,  F......................................................... 218

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