Sec. 167. The Administrator  shall, and a State may,  take such
measures,including  issuance of an  order, or  seeking injunctive
relief, as necessary to  prevent the construction or modification
of  a major  emitting  facility which  does  not conform  to  the
requirements of this part, or which is proposed to be constructed
in any area designated  pursuant to section 107(d) as  attainment
or unclassifiable and  which is not subject  to an implementation
plan which meets the requirements of this part.
[42 U.S.C. 7477]