🌍EPA Proposes Approval of Ohio's Ozone Regulation Revisions
The Environmental Protection Agency (EPA) is proposing to approve revisions to Ohio Administrative Code (OAC) Chapters 3745-21 and 3745-110 into the Ohio State Implementation Plan (SIP). The Ohio Environmental Protection Agency ("Ohio" or "Ohio EPA") submitted these revisions on March 30, 2022, and supplemented the submittal on February 1, 2023, and August 28, 2023. EPA is proposing to approve parts of OAC Chapters 3745-21 and 3745-110 as satisfying some of the Moderate Volatile Organic Compound (VOC) Reasonably Available Control Technology (RACT) and Nitrogen Oxide (NO<INF>x</INF>) RACT requirements for the Cleveland, OH nonattainment area (Cuyahoga, Geauga, Lake, Lorain, Medina, Portage, and Summit counties) under the 2015 ozone National Ambient Air Quality Standard ("NAAQS" or "standard"). Finally, EPA is proposing to approve OAC rule 3745-15-03, submitted by Ohio on February 9, 2023, and supplemented on December 1, 2023, and December 30, 2024.
Learn More🌫️EPA Approves Emission Rule Revision in Mojave Desert Air Quality Management
The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Mojave Desert Air Quality Management District (MDAQMD) portion of the California State Implementation Plan (SIP). This revision concerns emissions of volatile organic compounds (VOCs) and oxides of nitrogen (NO<INF>X</INF>) from internal combustion engines. We are approving a local rule that regulates these emission sources under the Clean Air Act (CAA or the "Act"). The EPA is also making additional administrative updates to the MDAQMD portion of the California SIP by correcting text in the Code of Federal Regulations.
Learn More🚛Proposed Rules for Heavy-Duty Vehicle Inspections in California
The U.S. Environmental Protection Agency (EPA) is proposing to partially approve and partially disapprove or, in the alternative, to fully approve a submission by the State of California to revise its State Implementation Plan (SIP) relating to the control of emissions from non-gasoline combustion vehicles over 14,000 pounds. EPA is proposing to disapprove the State's "Heavy-Duty Inspection and Maintenance Regulation" to the extent it applies to vehicles registered out-of-state or out-of-country. The EPA has substantial concerns that the State has not provided adequate assurances under Clean Air Act (CAA) section 110(a)(2)(E)(i) that implementation of the SIP is not prohibited by Federal law. EPA seeks comment on this and other aspects of this proposed rule. If finalized as a partial approval and partial disapproval, this rule would allow certain aspects of the covered State regulations to go into effect and would not trigger CAA section 179 sanctions because the submittal is not a required submission under CAA section 110(a)(2). If finalized as an approval, this rule would allow all covered State regulations to go into effect.
Learn More🌬️EPA's Air Quality Regulations Update for California 2024
The Environmental Protection Agency (EPA) is revising the format for materials submitted by the State of California that are incorporated by reference into the California State Implementation Plan (SIP). The regulations and other materials affected by this format change have all been previously submitted by the State of California and approved by the EPA. This format revision will primarily affect the "Identification of plan--in part" sections, as well as the format of the SIP materials that will be available for public inspection at the EPA Regional Office and the National Archives and Records Administration (NARA). This action, which only relates to source- specific requirements and certain local and regional California air district rules, is the fourth of a series of actions intended to change the format for the entire California SIP.
Learn More🌍EPA Determines Attainment for Sacramento Metro Area Ozone Standards
The Environmental Protection Agency (EPA) is finalizing our determination that the Sacramento Metro, California area attained the 2008 8-hour ozone national ambient air quality standards (NAAQS) by its December 31, 2024 attainment date. This determination is based on quality-assured and certified ambient air quality monitoring data from 2022 through 2024. We are also finalizing a determination that the requirement for the State to have contingency measures for reasonable further progress (RFP) and attainment for the 2008 ozone NAAQS no longer applies for this area.
Learn More🌬️EPA Approves Removal of Nitrogen Oxides Emission Rules in Missouri
The Environmental Protection Agency (EPA) is taking final action to approve a revision to the State Implementation Plan (SIP) submitted by the Missouri Department of Natural Resources (MoDNR) on November 14, 2018. MoDNR requested that the EPA remove from its SIP two rules related to control of emissions of nitrogen oxides (NO<INF>X</INF>). One of the rules previously applied to electricity generating units (EGUs) and certain non-EGUs in a portion of the state and the other rule previously applied to EGUs throughout the entire state. The EPA has already approved a SIP revision that included provisions to sunset the two rules, and removal of the now-sunsetted rules from the SIP would not have an adverse effect on air quality. The EPA's approval of this rule revision is being done in accordance with the requirements of the Clean Air Act (CAA).
Learn More🌍EPA Approves New York Emission Statement Certification
The Environmental Protection Agency (EPA) is approving portions of the comprehensive State Implementation Plan (SIP) revisions submitted by New York State that certify that the State has satisfied the requirements for an emission statement program for both the Serious and Moderate classifications of the 2008 and 2015 ozone National Ambient Air Quality Standards (NAAQS), respectively. These actions are being taken in accordance with the requirements of the Clean Air Act (CAA). The EPA proposed to approve this SIP revision on May 8, 2025, and received no comments.
Learn More🌬️EPA Proposes Air Quality Fees for South Coast California Businesses
The Environmental Protection Agency (EPA) is proposing to approve a revision to the South Coast Air Quality Management District (SCAQMD) portion of the California State Implementation Plan (SIP) concerning a rule submitted to address section 185 of the Clean Air Act (CAA or "Act") with respect to the 1997 and 2008 8-hour ozone National Ambient Air Quality Standards (NAAQS or "standard"). We are taking comments on this proposal and plan to follow with a final action.
Learn More🌍EPA's Interim Decision on Air Quality Regulations in California
The Environmental Protection Agency (EPA) is making an interim final determination that the California Air Resources Board (CARB) has submitted a Clean Air Act (CAA or "Act") state implementation plan (SIP) revision on behalf of the Mojave Desert Air Quality Management District (MDAQMD or "District") that corrects deficiencies concerning the District's New Source Review (NSR) stationary source permitting program. This determination is based on a proposed conditional approval, published elsewhere in this issue of the Federal Register, of MDAQMD Rules. The effect of this interim final determination is to stay the application of the offset sanction and to defer or stay the action of the highway sanction that were triggered by the EPA's limited disapproval of MDAQMD Rules on June 30, 2023.
Learn More🌬️Proposed EPA Rule on Nitrogen Oxides Control Technology in Texas
Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is proposing to approve revisions to the Texas State Implementation Plan (SIP). The revisions were submitted by the Texas Commission on Environmental Quality (TCEQ) on May 12, 2020, and May 13, 2020, and address certain CAA requirements for the Dallas-Fort Worth (DFW) Serious Nonattainment Area (NAA) for the 2008 ozone National Ambient Air Quality Standard (NAAQS). Specifically, EPA is proposing to approve the revisions to 30 Texas Administrative Code (TAC) Chapter 117 to implement the major source Reasonably Available Control Technology (RACT) requirement for Nitrogen Oxides (NO<INF>X</INF>), as addressed in the NO<INF>X</INF> RACT analysis and negative declaration included with the Serious area Attainment Demonstration (AD) SIP revision. The volatile organic compounds (VOC) portion of the RACT analysis in the Serious area AD submittal is addressed in a separate action.
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