Nov. 27, 2024 | ADEQ Comments on EPA's Proposed Consent Decree Affecting the Hayden SO₂ Nonattainment Area | View Letter >

Sept. 23, 2024 | ADEQ Comments on EPA's Proposed Conditional Approval of Maricopa County Air Pollution Control Rule 205 | View Letter >

Aug. 21, 2024 | ADEQ Requests Support for Good Samaritan Remediation of Abandoned Hardrock Mines Act of 2024 | View Letters >

July 15, 2024 | ADEQ Comments on EPA's Proposed Action for AZ's Regional Haze SIP for the Second Planning Period | View Letter >

June 25, 2024 | ADEQ Comments on EPA's "Protection of Visibility: Amendments to Requirements for State Plans Rule" | View Letter >

June 19, 2024 | ADEQ Requests Congress Increase Federal Grants to State and Local Air Quality Agencies to $500 Million in FY25 | View Letters >

May 31, 2024 | ADEQ Requests EPA Extend Comment Period for Proposed Air Quality Regional Haze SIP for the Second Implementation Period | View Letter >

May 16, 2024 | ADEQ Comments on EPA's Proposed Ozone Good Neighbor Plan for AZ | View Letter > 

Dec. 21, 2023 | ADEQ Comments on EPA's 2023 Proposed Revisions to the Guideline on Air Quality Models and Enhancements to the AERMOD Dispersion Modeling system | View Letter >

Nov. 17, 2023 | ADEQ Comments on Proposed Amendments to the Air Emissions Reporting Requirements | View Letter >

Aug. 22, 2023 |  ADEQ Comments on EPA's Proposed Rulemaking on National Emission Standards for Hazardous Air Pollutants (Primary Copper Smelting) | View Letter >

Aug. 4, 2023 | ADEQ Comments on EPA's Proposed Power Plant Rule | View Letter > 

July 13, 2023 | ADEQ Presentation to Joint Legislative Ad Hoc Study Committee on Air Quality and Energy re: State Air Quality Planning — State Implementation Plan (SIP) | View Presentation >

March 20, 2023 | ADEQ Comments on EPA's Proposed Rulemaking on Reconsideration of the National Ambient Air Quality Standards for Particulate Matter | View Letter >