---
kind: "section"
citation: "42 U.S.C. § 7508"
title: "42"
title_heading: "The Public Health and Welfare"
number: "7508"
heading: "Guidance documents"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/42/7508"
units:
  - "Chapter 85 — Air Pollution Prevention and Control"
  - "Subchapter I — Programs and Activities"
  - "Part D — Plan Requirements for Nonattainment Areas"
  - "Subpart 1 — nonattainment areas in general"
---

# §7508. Guidance documents


The [Administrator](/usc/42/7602.md?p=a) shall issue guidance documents under [section 7408 of this title](/usc/42/7408.md) for purposes of assisting [States](/usc/42/7602.md?p=d) in implementing requirements of this part respecting the [lowest achievable emission rate](/usc/42/7501.md?p=3). Such a document shall be published not later than nine months after August 7, 1977, and shall be revised at least every two years thereafter.


## Source credit

(July 14, 1955, ch. 360, title I, § 178, as added Pub. L. 95–95, title I, § 129(b), Aug. 7, 1977, 91 Stat. 750.)