42 U.S.C. § 7511e: Transitional areas

If an area designated as an ozone nonattainment area as of November 15, 1990 , has not violated the national primary ambient air quality standard for ozone for the 36-month period commencing on January 1, 1987 , and ending on December 31, 1989 , the Administrator shall suspend the application of the requirements of this subpart to such area until December 31, 1991 . By June 30, 1992 , the Administrator shall determine by order, based on the area’s design value as of the attainment date, whether the area attained such standard by December 31, 1991 . If the Administrator determines that the area attained the standard, the Administrator shall require, as part of the order, the State to submit a maintenance plan for the area within 12 months of such determination. If the Administrator determines that the area failed to attain the standard, the Administrator shall, by June 30, 1992 , designate the area as nonattainment under section 7407(d)(4) of this title .