eCFR Reference Browser

---

title: "40 CFR §52.04"

source: "https://www.ecfr.gov/current/title-40/section-52.04"

title_number: "40"

volume_number: "3"

chapter_number: "Unknown"

subchapter_code: "C"

subchapter_subject: "AIR PROGRAMS (CONTINUED)"

part_code: "52"

part_subject: "APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS"

subpart_code: "A"

subpart_subject: "General Provisions"

section_number: "52.04"

section_subject: "Classification of regions."

cfr_reference: "40 CFR 52.04"

title_name: "Title 40"

title_subject: "Protection of Environment"

parts_covered: "Part 52 (§§ 52.01 to 52.1018)"

revised_date: "Revised as of July 1, 2019"

publication_date: "As of July 1, 2019"

contains_description: "Containing a codification of documents of general applicability and future effect"

publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"

---

Each subpart sets forth the priority classification, by pollutant, for each region in the State. Each plan for each region was evaluated according to the requirements of part 51 of this chapter applicable to regions of that priority.

§52.04 - Classification of regions.