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   achieve an emission reduction requirement set  forth in subsection

   (b)(1) or (c)(2),  and that such failure  is due in whole  or part

   to an  inability to fully  implement provisions approved  pursuant

   to this subsection, the Administrator shall require the State to

   implement  the contingency  measures to  the  extent necessary  to

   assure compliance with subsections (b)(1) and (c)(2).

Any reference to the term `attainment date' in subsection (b), (c), or

(d) which  is incorporated  by reference  into this subsection,  shall

refer to the attainment date for Extreme Areas.

   "(f)  NOx  Requirements.-(1)  The plan  provisions  required under

this  subpart  for  major   stationary  sources  of  volatile  organic

compounds  shall also apply to major stationary sources (as defined in

section 302  and subsections  (c), (d),  and (e)  of this section)  of

oxides of  nitrogen. This subsection  shall not  apply in the  case of

oxides  of nitrogen  for  those sources  for  which the  Administrator

determines (when the  Administrator approves a plan or  plan revision)

that net air quality benefits are greater in the absence of reductions

of  oxides of  nitrogen from  the sources  concerned. This  subsection

shall also not apply in the case of oxides of nitrogen for-

      "(A) nonattainment  areas not within an  ozone transport region

   under  section  184  if the  Administrator  determines  (when  the

   Administrator approves  a plan or  plan revision) that  additional

   reductions  of  oxides   of  nitrogen  would  not   contribute  to

   attainment  of the national ambient air quality standard for ozone

   in the area, or

      "(B) nonattainment areas within  such an ozone transport region

   if the Administrator  determines (when the Administrator  approves

   a plan or plan revision)  that additional reductions of  oxides of

   nitrogen would not  produce net ozone air quality benefits in such

   region.

The  Administrator  shall,  in  the   Administrator's  determinations,

consider the study required under section 185B.

   "(2)(A) If the Administrator determines that  excess reductions in

emissions  of  NOx   would  be  achieved  under  paragraph   (1),  the

Administrator may limit the application of paragraph (1) to the extent

necessary to avoid achieving such excess reductions.

   "(B)  For  purposes  of  this  paragraph,   excess  reductions  in

emissions of  NOx are emission reductions for  which the Administrator

determines that net air quality benefits are greater in the absence of

such reductions. Alternatively, for purposes of this paragraph, excess

reductions in emissions of NOx are, for-

      "(i) nonattainment  areas not within an  ozone transport region

   under  section  184, emission  reductions  that the  Administrator

   determines  would not  contribute to  attainment  of the  national

   ambient air quality standard for ozone in the area, or

      "(ii) nonattainment  areas within such ozone  transport region,

   emission reductions that  the Administrator  determines would  not

   produce net ozone air quality benefits in such region.

   "(3) At  any time  after the  final report  under section  185B is

submitted to Congress, a  person may petition the Administrator  for a

determination  under  paragraph  (1)  or  (2)  with  respect   to  any

nonattainment  area or any  ozone transport region  under section 184.

The  Administrator shall grant or  deny such petition  within 6 months

after its filing with the Administrator.

   "(g) Milestones.-

      "(1)  Reductions in  emissions.-6 years after  the date  of the

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