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           ambient air quality standard for the pollutant,

              "(ii)  attainment,  any  area   (other  than  an   area

identified in clause           (i) that meets the national  primary or

                              secondary ambient  air quality standard

                              for the pollutant, or

              "(iii)   unclassifiable,  any   area  that   cannot  be

           classified  on  the  basis  of  available  information  as

           meeting or not  meeting the national primary  or secondary

           ambient air quality standard for the pollutant.

         The Administrator may not require the Governor to submit the

         required list sooner than 120 days after  promulgating a new

         or revised national ambient air quality standard.

           "(B)  Promulgation  by  EPA   of  designations.-(i)   Upon

      promulgation or   revision of  a national  ambient air  quality

                        standard, the Administrator shall  promulgate

                        the designations  of all  areas (or  portions

                        thereof)  submitted under subparagraph (A) as

                        expeditiously as  practicable, but in no case

                        later  than   2  years  from   the  date   of

                        promulgation of  the new or revised  national

                        ambient  air  quality standard.  Such  period

                        may be  extended for up  to one  year in  the

                        event  the  Administrator  has   insufficient

                        information to promulgate the designations.

              "(ii) In making the promulgations required under clause

      (i), the   Administrator  may make  such  modifications  as the

                 Administrator deems necessary to the designations of

                 the  areas  (or  portions thereof)  submitted  under

                 subparagraph  (A) (including  to  the  boundaries of

                 such  areas  or  portions  thereof).   Whenever  the

                 Administrator  intends to  make a  modification, the

                 Administrator  shall notify  the  State  and provide

                 such State  with an  opportunity to  demonstrate why

                 any  proposed  modification  is  inappropriate.  The

                 Administrator shall give  such notification no later

                 than 120  days  before  the date  the  Administrator

                 promulgates    the   designation,    including   any

                 modification  thereto.  If  the  Governor  fails  to

                 submit the  list in  whole or in  part, as  required

                 under subparagraph(A), theAdministrator shallpromul-

         gate   the   designation   that  the   Administrator   deems

         appropriate for any area (or portion thereof) not designated

         by the State.

           "(iii) If  the Governor  of any State,  on the  Governor's

own motion, under   subparagraph  (A),  submits a  list  of  areas (or

                   portions  thereof)  in  the  State  designated  as

                   nonattainment, attainment, or  unclassifiable, the

                   Administrator shall  act on  such designations  in

                   accordance  with  the  procedures under  paragraph

                   (3) (relating to redesignation).

           "(iv) A designation for an area (or portion thereof)  made

      pursuant to  this subsection shall remain  in effect until  the

                   area   (or   portion   thereof)  is   redesignated

                   pursuant to paragraph (3) or (4).

           "(C)  Designations  by  operation  of  law.-(i)  Any  area

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