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Carbon Monoxide Information

This page provides detailed information on designations and classifications of carbon monoxide nonattainment areas.

  1. Nonattainment Area Selections

    As of September 27, 2010, all Carbon Monoxide areas have been redesignated to maintenance areas

  2. Maintenance Area Selections (Previously Nonattainment Areas)
    1. Area Listings
      1. Classified Areas Sorted by Classification
      2. Not Classified Areas
      3. Sorted by State/Area/County
      4. Sorted by Area/State/County
    2. Area Designation Data
      1. Classified
      2. Not Classified

  3. Other Information
    1. Summary Reports
      1. Maintenance Area Summary Report

  4. Federal Register Notices Relating to CO Designations and Classifications
    1. November 6, 1991 Federal Register Notice (PDF)
    2. Carbon Monoxide (CO) Standards - Documents from Current Review
    3. Attainment Date Extensions
      These extensions modify the dates shown in the nonattainment areas above
    4. Changes to a Higher Classification
    5. All Notices
      1. Notices Listed By Category
      2. Notices Listed By Area Name
      3. Notices Listed By State then Area
      4. Notices Listed By Date

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