40 CFR 58.50 – Index reporting
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(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.