2025 State Area Designations Regulation

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This page last reviewed December 17, 2025

Proposed 2025 Amendments to Area Designations for State Ambient Air Quality Standards

Public Comments Received
Adopted Regulations and Materials Submitted to OAL

The Final Package was submitted to OAL on July 3, 2026.  OAL has until August 14, 2026, to make a decision.

Final Statement of Reasons
Updated Informative Digest
Executive Order
Final Regulation Order A-1
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Public Hearing Notice and Related Material
Posted
Notice of Comment Period (Deadline to Request a Public Hearing, December 29, 2025)
Staff Report: Initial Statement of Reasons
Appendix A-1: Proposed Regulation Order
Appendix A-2: Alternative 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