Ambient Air Quality Surveillance
---
identifier: "/us/fr/E9-15326"
source: "fr"
legal_status: "authoritative_unofficial"
title: "Ambient Air Quality Surveillance"
title_number: 0
title_name: "Federal Register"
section_number: "E9-15326"
section_name: "Ambient Air Quality Surveillance"
positive_law: false
currency: "2009-06-26"
last_updated: "2009-06-26"
format_version: "1.1.0"
generator: "[email protected]"
agency: "Environmental Protection Agency"
document_number: "E9-15326"
document_type: "rule"
publication_date: "2009-06-26"
agencies:
- "Environmental Protection Agency"
cfr_references:
- "40 CFR Part 58"
fr_citation: "74 FR 30469"
fr_volume: 74
---
# Ambient Air Quality Surveillance
**CFR Correction**
In Title 40 of the Code of Federal Regulations, Parts 53 to 59, revised as of July 1, 2008, on page 271, in appendix G to part 58, Table 2 is corrected to read as follows:
**Appendix G to Part 58—Uniform Air Quality Index (AQI) and Daily Reporting**
| These breakpoints | O
(ppm) | O
(ppm) | PM | PM | CO (ppm) | SO
(ppm) | NO
(ppm) | Equal these AQI's | AQI | Category |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 0.000-0.059 | | 0.0-15.4 | 0-54 | 0.0-4.4 | 0.000-0.034 | (
) | 0-50 | Good. | | |
| 0.060-0.075 | | 15.5-40.4 | 55-154 | 4.5-9.4 | 0.035-0.144 | (
) | 51-100 | Moderate. | | |
| 0.076-0.095 | 0.125-0.164 | 40.5-65.4 | 155-254 | 9.5-12.4 | 0.145-0.224 | (
) | 101-150 | Unhealthy for Sensitive Groups. | | |
| 0.096-0.115 | 0.165-0.204 | 65.5-150.4 | 255-354 | 12.5-15.4 | 0.225-0.304 | (
) | 151-200 | Unhealthy. | | |
| 0.116-0.374 | 0.205-0.404 | 150.5-250.4 | 355-424 | 15.5-30.4 | 0.305-0.604 | 0.65-1.24 | 201-300 | Very Unhealthy. | | |
| (
) | 0.405-0.504 | 250.5-350.4 | 425-504 | 30.5-40.4 | 0.605-0.804 | 1.25-1.64 | 301-400 | | | |
| (
) | 0.505-0.604 | 350.5-500.4 | 505-604 | 40.5-50.4 | 0.805-1.004 | 1.65-2.04 | 401-500 | Hazardous. | | |