eCFR Reference Browser

---

title: "40 CFR §58.50"

source: "https://www.ecfr.gov/current/title-40/section-58.50"

title_number: "40"

volume_number: "6"

chapter_number: "Unknown"

subchapter_code: "C"

subchapter_subject: "AIR PROGRAMS (CONTINUED)"

part_code: "58"

part_subject: "AMBIENT AIR QUALITY SURVEILLANCE"

subpart_code: "F"

subpart_subject: "Air Quality Index Reporting"

section_number: "58.50"

section_subject: "Index reporting."

cfr_reference: "40 CFR 58.50"

title_name: "Title 40"

title_subject: "Protection of Environment"

parts_covered: "Parts 53 to 59"

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"

---

(a)The State or where applicable, local agency shall report to the general public on a daily basis through prominent notice an air quality index that complies with the requirements of appendix G to this part.

(b)Reporting is required for all individual MSA with a population exceeding 350,000.

(c)The population of a metropolitan statistical area for purposes of index reporting is the latest available U.S. census population.

§58.50 - Index reporting.