42 U.S.C. § 7471
Section 7471 · Plan requirements
Amended 3 times on record
Applied in 32 court decisions — leading case Citizens to Save Spencer County v. United States Environmental Protection Agency (1979)
Most recently applied in Board of County Commissioners of Weld County, CO v. EPA (June 2023)
How often courts cite this section
Court decisions citing this, by year.Markers show enactment, consequential amendments, and circuit splits over this section — watch for a citation surge after a change or a disagreement. The dip in the last several years is a data-coverage gap, not a real trend — our corpus holds fewer opinions from the most recent years, so recent citations are undercounted.
In accordance with the policy of section 7401(b)(1) of this title, each applicable implementation plan shall contain emission limitations and such other measures as may be necessary, as determined under regulations promulgated under this part, to prevent significant deterioration of air quality in each region (or portion thereof) designated pursuant to section 7407 of this title as attainment or unclassifiable.
Editorial notes U.S. Code · Office of the Law Revision Counsel
Amendments
1990—Pub. L. 101–549 substituted “designated pursuant to section 7407 of this title as attainment or unclassifiable” for “identified pursuant to section 7407(d)(1)(D) or (E) of this title”.