Code of Federal Regulations Title 40. Protection of Environment § 40.51.906 Redesignation to nonattainment following initial designations for the 8–hour NAAQS

For any area that is initially designated attainment or unclassifiable for the 8–hour NAAQS and that is subsequently redesignated to nonattainment for the 8–hour ozone NAAQS, any absolute, fixed date applicable in connection with the requirements of this part is extended by a period of time equal to the length of time between the effective date of the initial designation for the 8–hour NAAQS and the effective date of redesignation, except as otherwise provided in this subpart.