National Primary and Secondary Ambient Air Quality Standards
---
identifier: "/us/fr/02-55506"
source: "fr"
legal_status: "authoritative_unofficial"
title: "National Primary and Secondary Ambient Air Quality Standards"
title_number: 0
title_name: "Federal Register"
section_number: "02-55506"
section_name: "National Primary and Secondary Ambient Air Quality Standards"
positive_law: false
currency: "2002-03-15"
last_updated: "2002-03-15"
format_version: "1.1.0"
generator: "[email protected]"
agency: "Environmental Protection Agency"
document_number: "02-55506"
document_type: "rule"
publication_date: "2002-03-15"
agencies:
- "Environmental Protection Agency"
cfr_references:
- "40 CFR Part 50"
fr_citation: "67 FR 11579"
fr_volume: 67
---
# National Primary and Secondary Ambient Air Quality Standards
**CFR Correction**
In Title 40 of the Code of Federal Regulations, parts 50 to 51, revised as of July 1, 2001, on page 62, in Part 50 Appendix H, under the third heading, the fifth paragraph is amended by correcting the formula to read as follows:
**Appendix H to Part 50—Interpretation of the 1-Hour Primary and Secondary National Ambient Air Quality Standards for Ozone**
**3. Estimating the Number of Exceedances for a Year**