2024 State Area Designations Regulation

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This page last reviewed November 26, 2024

2024 Amendments to Area Designations for State Ambient Air Quality Standards

Hearing Date(s)
Public Comments Received
Erratum
Final Approval / OAL Action

OAL approved this rulemaking and filed with the Secretary of State on September 9, 2025.  The amendments are effective January 1, 2026.

Posted
Final Statement of Reasons
Final Regulation Order
Alternate Format to the Final Regulation Order
Adopted Regulations and Materials Submitted to OAL
Posted
Updated Informative Digest
Hearing Action and Supplemental 15 Day Notices
Posted
Resolution 25-1
Public Hearing Notice and Related Material

Posted November 26, 2024

Notice of Public Hearing  (Deadline to Submit Public Comments: January 13, 2025, or at the Public Hearing)
Staff Report: Initial Statement of Reasons
Appendix A-1: Proposed Regulation Order
Appendix A-2: Alternate Version of the Proposed Regulation Order
Appendix B: Area Designations Criteria
Appendix C: Maps and Tables of Area Designations for State and National Ambient Air Quality Standards
Appendix D: Convention for Rounding Ambient Air Quality Data
Appendix E: Designation Values and Expected Peak Day Concentrations
Appendix F: Designation Value Tables