Carbon Monoxide Information
This page provides detailed information on designations and classifications of carbon monoxide nonattainment areas.
- Nonattainment Area Selections
- Area Listings
- Classified Areas Sorted by Classification
- Not Classified Areas (no areas remain)
- Sorted by State/Area/County
- Sorted by Area/State/County
- Area Maps
- Area Designation Data
- Classified
- Not Classified (no areas remain)
- Area Listings
- Maintenance Area Selections (Previously Nonattainment Areas)
- Area Listings
- Area Designation Data
- Other Information
- Summary Reports
- Federal Register Notices Relating to CO Designations and Classifications
- Nov. 6, 1991 Federal Register Notice
- Clean Air/Attainment Determinations
- Attainment Date Extensions
These extensions modify the dates shown in the nonattainment areas above - Changes to a Higher Classification
- All Notices