Sec.  117. (a) In order to obtain assistance in the development
and  implementation of  the purposes  of this  Act including  air
quality  criteria,  recommended  control  techniques,  standards,
research and development, and  to encourage the continued efforts
on the  part of industry  to improve  air quality and  to develop
economically feasible  methods for  the control and  abatement of
air  pollution,  the  Administrator   shall  from  time  to  time
establish advisory  committees. Committee members  shall include,
but not be  limited to, persons who are  knowledgeable concerning
air quality from the standpoint of health, welfare, economics, or
technology.
  (b)  The members  of  any other  advisory committees  appointed
pursuant to this  Act who are  not officers or  employees of  the
United States  while attending  conferences or meetings  or while
otherwise serving at  the request of the  Administrator, shall be
entitled to  receive compensation at  a rate  to be fixed  by the
Administrator, but not exceeding  $100 per diem, including travel
time,  and while  away  from their  homes  or regular  places  of
business they may  be allowed travel expenses, including per diem
in lieu  of subsistence, as authorized by section 5703 of title 5
of the United States  Code for persons in the  Government service
employed intermittently.
  (c) Prior to - 
       (1) issuing  criteria for  an air pollutant  under section
     108(a)(2),
       (2)  publishing  any  list under  section  111(b)(1)(A) or
     112(b)(1)(A),
       (3) publishing  any standard under section  111 or section
     112, or
       (4) publishing  any regulation  under section  202(a), the
     Administrator  shall,  to  the  maximum  extent  practicable
     within the time provided, consult  with appropriate advisory
     committees, independent experts, and Federal departments and
     agencies.
[42 U.S.C. 7417]