StacksVerified U.S. regulatory reference

40 CFR §58.50

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (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.
  2. (b)Reporting is required for all individual MSA with a population exceeding 350,000.
  3. (c)The population of a metropolitan statistical area for purposes of index reporting is the latest available U.S. census population.