Sec.  121.  In  carrying  out  the  requirements  of  this  Act
requiring applicable implementation plans to contain - 
     (1)  any  transportation controls,  air  quality maintenance
  plan requirements  or preconstruction review of  direct sources
  of air pollution, or
     (2) any measure referred to - 
            (A) in part  D (pertaining to  nonattainment require-
          ments), or
            (B) in  part C (pertaining to  prevention of signifi-
          cant deterioration),
and in carrying out the  requirements of section 113(d) (relating
to certain enforcement orders), the State  shall provide a satis-
factory  process  of  consultation  with  general  purpose  local
govern-ments,  designated organizations  of elected  officials of
local gov-ernments and any  Federal land manager having authority
over Fed-eral  land to  which the  State plan  applies, effective
with respect to any  such requirement which is adopted  more than
one  year  after the  date  of  enactment of  the  Clean  Air Act
Amendments of 1977 as part of such plan. Such process shall be in
accordance with regu-lations promulgated by  the Administrator to
assure adequate  con-sultation. The Administrator shall update as
necessary  the  origi-nal  regulations required  and  promulgated
under this section (as  in effect immediately before the  date of
the enactment of the Clean Air Act Amendments  of 1990) to ensure
adequate  consultation.  Only a  general  purpose  unit of  local
government,  regional agency, or council of governments adversely
affected by action of the Admin-istrator approving any portion of
a  plan referred to in this sub-section may petition for judicial
review  of  such  action on  the  basis  of  a  violation of  the
requirements of this section.
[42 U.S.C. 7421]