---
kind: "section"
citation: "40 C.F.R. § 58.50"
title: "40"
number: "58.50"
heading: "Index reporting."
url: "https://uscodex.org/cfr/40/58.50"
---

# §58.50. Index reporting.

- (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.

## Notes

### Amendments

[71 FR 61302, Oct. 17, 2006, as amended at 80 FR 65466, Oct. 26, 2015]

### Authority

Authority: 42 U.S.C. 7403, 7405, 7410, 7414, 7601, 7611, 7614, and 7619.

### Source

Source: 44 FR 27571, May 10, 1979; 59 FR 41628, Aug. 12, 1994, unless otherwise noted.

### Amendments

[71 FR 61302, Oct. 17, 2006, as amended at 80 FR 65466, Oct. 26, 2015]