by transport from an upwind area to a degree 
that affects the area’s ability to attain, 
the Administrator, in lieu of such reclassification, 
may extend the attainment date for such downwind 
area for such standard in accordance with paragraph 
(5). 
‘‘(3) APPROVAL.—In order to extend the attain-
ment date for a downwind area under this sub-
section, the Administrator may approve a revision of 
the applicable implementation plan for the downwind 
area for such standard that— 
‘‘(A) complies with all requirements of this 
Act applicable under the current classification 
of the downwind area, including any require-
ments applicable to the area under section 
172(c) for such standard; 
‘‘(B) includes any additional measures 
needed to demonstrate attainment by the ex-
tended attainment date provided under this 
subsection, and provides for implementation of 
those measures as expeditiously as practicable; 
and 
‘‘(C) provides appropriate measures to en-
sure that no area downwind of the area receiv-
ing the extended attainment date will be af-
fected by transport to a degree that affects the 
area’s ability to attain, from the area receiving 
the extension. 
‘‘(4) PRIOR
RECLASSIFICATION
DETERMINA-
TION.—If, after April 1, 2003, and prior to the time 
the 1-hour ozone standard no longer applies to a 
downwind area, the Administrator made a reclassi-
fication determination under subsection (b)(2)(A) 
for such downwind area, and the Administrator ap-
proves a plan consistent with subparagraphs (A) and 
(B) for such area, the reclassification shall be with-
drawn and, for purposes of implementing the 8-hour 
ozone national ambient air quality standard, the 
area shall be treated as if the reclassification never 
occurred. Such plan must be submitted no later than 
12 months following enactment of this subsection— 
‘‘(A) the plan revision for the downwind 
area complies with all control and planning re-
quirements of this Act applicable under the 
classification that applied immediately prior to 
reclassification, including any requirements ap-
plicable to the area under section 172(c) for 
such standard; and 
‘‘(B) the plan includes any additional 
measures needed to demonstrate attainment no
later than the date on which the last reductions 
in pollution transport that have been found by 
the Administrator to significantly contribute to 
nonattainment are required to be achieved by 
the upwind area or areas. 
The attainment date extended under this paragraph 
shall provide for attainment of such national ambi-
ent air quality standard for ozone in the downwind 
area as expeditiously as practicable but no later than 
the end of the first complete ozone season following 
the date on which the last reductions in pollution 
transport that have been found by the Administrator 
to significantly contribute to nonattainment are re-
quired to be achieved by the upwind area or areas. 
‘‘(5) EXTENDED DATE.—The attainment date 
extended under this subsection shall provide for at-
tainment of such national ambient air quality stand-
ard for ozone in the downwind area as expeditiously 
as practicable but no later than the new date that 
the area would have been subject to had it been re-
classified under subsection (b)(2). 
‘‘(6) RULEMAKING.—Within 12 months after 
the enactment of this subsection, the Administrator 
shall, through notice and comment, promulgate rules 
to define the term ‘affected by transport to a degree