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   may reclassify as  a Serious PM-10 nonattainment  area (identified

   in  this subpart  also  as a  `Serious Area')  any  area that  the

   Administrator determines  cannot practicably  attain the  national

   ambient air quality  standard for PM-10 by the attainment date (as

   prescribed   in   subsection  (c))   for   Moderate   Areas.   The

   Administrator shall  reclassify appropriate  areas  as Serious  by

   the following dates:  

         "(A) For  areas  designated  nonattainment for  PM-10  under

      section   107(d)(4),   the  Administrator   shall   propose  to

      reclassify appropriate areas  by June 30, 1991,  and take final

      action by December 31, 1991.

         "(B)  For areas  subsequently designated  nonattainment, the

      Administrator  shall  reclassify  appropriate areas  within  18

      months  after the required date for the State's submission of a

      SIP for the Moderate Area.  

      "(2)  Reclassification upon failure  to attain.-Within 6 months

   following   the   applicable   attainment   date   for   a   PM-10

   nonattainment  area, the Administrator shall determine whether the

   area  attained the  standard by  that date.  If the  Administrator

   finds that  any  Moderate Area  is  not  in attainment  after  the

   applicable attainment date-

         "(A) the area shall be reclassified by operation of law as a

      Serious Area; and

           "(B)  the Administrator  shall  publish  a notice  in  the

      Federal  Register   no  later  than  6   months  following  the

      attainment  date,  identifying the  area  as  having failed  to

      attain  and  identifying the  reclassification  described under

      subparagraph (A).

   "(c) Attainment  Dates.-Except as provided  under subsection  (d),

the  attainment  dates  for  PM-10  nonattainment  areas  shall  be as

follows:

      "(1) Moderate  areas.-For a Moderate Area,  the attainment date

   shall  be as  expeditiously as practicable  but no  later than the

   end  of the  sixth calendar year  after the  area's designation as

   nonattainment,  except  that,  for areas  designated nonattainment

   for  PM-10 under section 107(d)(4), the  attainment date shall not

   extend beyond December 31, 1994.

      "(2)  Serious areas.-For  a Serious  Area, the  attainment date

   shall  be as  expeditiously as practicable  but no  later than the

   end  of  the  tenth  calendar  year  beginning  after  the  area's

   designation  as nonattainment, except  that, for  areas designated

   nonattainment for  PM-10 under section  107(d)(4), the date  shall

   not extend beyond December 31, 2001.

   "(d)  Extension  of  Attainment  Date  for  Moderate   Areas.-Upon

application  by  any   State,  the  Administrator  may  extend  for  1

additional year (hereinafter referred to  as the `Extension Year') the

date specified in paragraph (c)(1) if-

      "(1)  the   State  has  complied  with   all  requirements  and

   commitments   pertaining   to   the   area   in   the   applicable

   implementation plan; and

   "(2) no more than one  exceedance of the 24-hour  national ambient

air quality    standard level  for PM-10 has  occurred in the  area in

              the year  preceding the Extension Year,  and the annual

              mean  concentration of PM-10 in  the area for such year

              is less than or equal to the standard level.

No more than 2 one-year extensions may be issued  under the subsection

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