Technology Transfer Network / NAAQS
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
Selected portions of the Clean Air Act
Sec 107 Sec. 107. ... (d) Designations.- ... (3) Redesignation.- ... (E) The Administrator may not promulgate a redesignation of a nonattainment area (or portion thereof) to attainment unless - (i) the Administrator determines that the area has attained the national ambient air quality standard; (ii) the Administrator has fully approved the applicable implementation plan for the area under section 110(k); (iii) the Administrator determines that the improvement in air quality is due to permanent and enforceable reductions in emissions resulting from implementation of the applicable implementation plan and applicable Federal air pollutant control regulations and other permanent and enforceable reductions; (iv) the Administrator has fully approved a maintenance plan for the area as meeting the requirements of section 175A; and (v) the State containing such area has met all requirements applicable to the area under section 110 and part D. SEC. 175A. MAINTENANCE PLANS. (a) Plan Revision.- Each State which submits a request under section 107(d) for redesignation of a nonattainment area for any air pollutant as an area which has attained the national primary ambient air quality standard for that air pollutant shall also submit a revision of the applicable State implementation plan to provide for the maintenance of the national primary ambient air quality standard for such air pollutant in the area concerned for at least 10 years after the redesignation. The plan shall contain such additional measures, if any, as may be necessary to ensure such maintenance. (b) Subsequent Plan Revisions.- 8 years after redesignation of any area as an attainment area under section 107(d), the State shall submit to the Administrator an additional revision of the applicable State implementation plan for maintaining the national primary ambient air quality standard for 10 years after the expiration of the 10-year period referred to in subsection (a). (c) Nonattainment Requirements Applicable Pending Plan Approv- al.- Until such plan revision is approved and an area is redesignated as attainment for any area designated as a nonattainment area, the requirements of this part shall continue in force and effect with respect to such area. (d) Contingency Provisions.- Each plan revision submitted under this section shall contain such contingency provisions as the Administrator deems necessary to assure that the State will promptly correct any violation of the standard which occurs after the redesignation of the area as an attainment area. Such provisions shall include a requirement that the State will implement all measures with respect to the control of the air pollutant concerned which were contained in the State implementa- tion plan for the area before redesignation of the area as an attainment area. The failure of any area redesignated as an attainment area to maintain the national ambient air quality standard concerned shall not result in a requirement that the State revise its State implementation plan unless the Administra- tor, in the Administrator's discretion, requires the State to submit a revised State implementation plan.