SEC. 174. PLANNING PROCEDURES.
  (a)  In  General.- For  any  ozone, carbon  monoxide,  or PM-10
nonattainment area,  the State  containing such area  and elected
officials of  affected local  governments shall, before  the date
required for submittal of  the inventory described under sections
182(a)(1) and  187(a)(1), jointly review and  update as necessary
the planning procedures adopted pursuant to this subsection as in
effect  immediately before the date of the enactment of the Clean
Air Act Amendments  of 1990, or  develop new planning  procedures
pursuant to  this subsection,  as appropriate. In  preparing such
procedures the State and  local elected officials shall determine
which  elements   of  a  revised  implementation   plan  will  be
developed,  adopted,  and  implemented (through  means  including
enforcement) by  the  State and  which  by local  governments  or
regional  agencies,  or  any combination  of  local  governments,
regional agencies, or the State. The implementation plan required
by  this part shall be  prepared by an  organization certified by
the  State,  in  consultation  with elected  officials  of  local
governments and  in accordance  with the determination  under the
second  sentence  of  this subsection.  Such  organization  shall
include elected  officials of  local governments in  the affected
area,  and  representatives of  the  State  air quality  planning
agency,   the   State   transportation   planning   agency,   the
metropolitan  planning organization  designated  to  conduct  the
continuing, cooperative and comprehensive transportation planning
process for the area under section 134 of title 23, United States
Code,   the  organization   responsible  for   the  air   quality
maintenance planning process  under regulations implementing this
Act,  and  any  other   organization  with  responsibilities  for
developing, submitting, or implementing the plan required by this
part.  Such  organization  may  be one  that  carried  out  these
functions before the date of  the enactment of the Clean Air  Act
Amendments of 1990.
  (b)  Coordination.-  The  preparation  of  implementation  plan
provisions  and subsequent  plan  revisions under  the continuing
transportation-air  quality planning process described in section
108(e) shall be coordinated  with the continuing, cooperative and
comprehensive  transportation  planning  process  required  under
section  134 of title 23,  United States Code,  and such planning
processes shall take into account the requirements of this part.
  (c) Joint Planning.- In  the case of a nonattainment  area that
is included within more  than one State, the affected  States may
jointly, through  interstate compact or otherwise,  undertake and
implement all  or part  of the  planning procedures  described in
this section.
[42 U.S.C. 7504]