🌫️EPA Approves Idaho's Regional Haze Implementation Plan
The Environmental Protection Agency (EPA) is approving the Idaho regional haze State Implementation Plan (SIP) revision submitted on August 5, 2022, supplemented on September 27, 2024, and clarified on August 12, 2025, as satisfying applicable requirements under the Clean Air Act and the EPA's Regional Haze Rule (RHR) for the program's second implementation period. The Idaho SIP revision addressed the requirement to make reasonable progress toward the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility in certain national parks and wilderness areas.
Learn More🌫️Proposed Revisions to Clean Air Act Permit Program in San Diego
The Environmental Protection Agency (EPA) is proposing approval of revisions to the Clean Air Act (CAA or "Act") Operating Permit Program (title V) of the San Diego County Air Pollution Control District (SDCAPCD or "District") in California. Once approved, these revisions will update the District's public noticing requirements to conform to current federal requirements for title V programs. We are taking comments on these proposed revisions and are simultaneously publishing our final action approving these revisions in a direct final rule.
Learn More🌬️Kentucky SO2 Nonattainment Regulations and Business Compliance
The Environmental Protection Agency (EPA) is proposing to approve two State Implementation Plan (SIP) revisions submitted by the Commonwealth of Kentucky, through the Energy and Environment Cabinet (Cabinet), Division of Air Quality (DAQ) on January 26, 2024, and February 15, 2024, to certify two requirements under the Clean Air Act (CAA or Act). These revisions establish that the Kentucky SIP satisfies the nonattainment new source review (NNSR) and base year emissions inventory requirements for the 2010 1-hour sulfur dioxide (SO<INF>2</INF>) national ambient air quality standard (NAAQS) for the Henderson-Webster SO<INF>2</INF> nonattainment area (hereinafter "Henderson-Webster SO<INF>2</INF> Nonattainment Area" or "Area"). These actions are being proposed pursuant to the CAA.
Learn More🌫️EPA Designates New Air Monitoring Methods for Ambient Air Quality
Notice is hereby given that the Environmental Protection Agency (EPA) has designated one new equivalent method for measuring SO<INF>2</INF>, one new reference method for measuring NO<INF>2</INF>, one new equivalent method for measuring concentrations of PM<INF>2.5</INF>, and one new equivalent method for measuring PM<INF>10-2.5</INF> in ambient air.
Learn More🌫️EPA Air Quality Regulations Changes Impacting Lane County Businesses
The Environmental Protection Agency (EPA) proposes to approve the June 26, 2024, submitted revisions to the Oregon State Implementation Plan (SIP) applicable in Lane County, Oregon. The changes update the local stationary source permitting regulations to align with existing State regulations. The revisions eliminate generic plant site emission limits in favor of source-specific and source- category specific limits, update construction notification requirements, clarify the use of modeling and monitoring for compliance assurance, and streamline the permit application process.
Learn More🌾EPA Announces Pesticide Petitions Affecting Agricultural Regulations
This document announces the Agency's receipt of and solicits public comment on initial filings of pesticide petitions requesting the establishment or modification of regulations for residues of pesticide chemicals in or on various commodities. The Agency is providing this notice in accordance with the Federal Food, Drug, and Cosmetic Act (FFDCA). EPA uses the month and year in the title to identify when the Agency compiled the petitions identified in this notice of filing. Unit II. of this document identifies certain petitions received in 2023, 2024, and 2025 that are currently being evaluated by EPA, along with information about each petition, including who submitted the petition and the requested action.
Learn More🌫️EPA Approves Missouri's Sulfur Dioxide Emission Control Revisions
The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Missouri State Implementation Plan (SIP) related to replacing the previous statewide sulfur dioxide (SO<INF>2</INF>) rule with the latest version of a newer SO<INF>2</INF> rule (10 CSR 10-6.261). The SIP revisions include removing outdated requirements and reinstating SO<INF>2</INF> emission limits for the Ameren-Labadie and Evergy-Hawthorn power plants. The revisions do not impact the stringency of the SIP, nor do they impact the state's ability to attain or maintain the National Ambient Air Quality Standards (NAAQS). The EPA is also approving Missouri's negative declaration of sources subject to sulfuric acid production requirements. This final approval action is being done in accordance with the requirements of the Clean Air Act (CAA).
Learn More🧪Massachusetts Hazardous Waste Program Revisions Authorized by EPA
Massachusetts has applied to the Environmental Protection Agency (EPA) for final authorization of revisions to its hazardous waste program under the Resource Conservation and Recovery Act (RCRA), as amended. The EPA has reviewed Massachusetts' application and has determined that these revisions satisfy all requirements needed to qualify for final authorization. Therefore, we are taking direct final action to authorize the State's changes. In the "Proposed Rules" section of this Federal Register, EPA is also publishing a separate document that serves as the proposal to authorize these revisions. Unless EPA receives written comments that oppose this authorization during the comment period, the decision to authorize Massachusetts' revisions to its hazardous waste program will take effect.
Learn More🌎Proposed Rule on VOC RACT Regulations in Texas DFW Area
Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is proposing to approve the May 12, 2020, and May 13, 2020, revisions to the Texas State Implementation Plan (SIP) as satisfying the Serious classification Volatile Organic Compounds (VOC) Reasonably Available Control Technology (RACT) requirement for the Dallas-Fort Worth (DFW) 2008 8-hour ozone National Air Quality Ambient Air Quality Standards (NAAQS) nonattainment area. The DFW area, designated as Serious for the 2008 8-hour ozone NAAQS, consists of Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise Counties. Specifically, we are proposing to approve the revisions to 30 Texas Administrative Code (TAC) Chapter 115 to implement the major source Reasonably Available Control Technology (RACT) requirement for VOC as addressed in the VOC RACT analysis and negative declaration included with the Serious area Attainment Demonstration (AD) SIP revision. The Nitrogen Oxide (NO<INF>X</INF>) portion of the RACT analysis in the May 13, 2020, revisions will be addressed in a separate action.
Learn More🌬️EPA Delegation Update
On January 21, 2025, the Environmental Protection Agency (EPA) sent the State of West Virginia (West Virginia) a letter acknowledging that West Virginia's delegation of authority to implement and enforce the National Emissions Standards for Hazardous Air Pollutants (NESHAP) and New Source Performance Standards (NSPS) had been updated, as provided for under previously approved delegation mechanisms. To inform regulated facilities and the public, EPA is making available a copy of EPA's letter to West Virginia through this notice.
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