2025 State Area Designations Regulation

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This page last reviewed Octubre 6, 2025

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

Hearing Date(s)
Public Comments Received
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