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Browse 83 rules and proposed rules from the Federal Register.
83
Total Regulations
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The Environmental Protection Agency (EPA) is extending the comment period for the proposed "Interstate Transport Plan Review for the 2015 Ozone NAAQS," published in the Federal Register on January 30, 2026. The current comment period for the proposed rule is set to end on March 2, 2026. The EPA has received numerous requests to extend the comment period. The EPA is extending the comment period for the proposed action to March 23, 2026.
The Environmental Protection Agency (EPA) is proposing to approve the regional haze State Implementation Plan (SIP) revision submitted by the Illinois Environmental Protection Agency (Illinois EPA) on June 3, 2024, as satisfying applicable requirements under the Clean Air Act (CAA) and the EPA's Regional Haze Rule for the program's second implementation period. The EPA proposes to find that Illinois' regional haze SIP submission fulfills the requirement that States must periodically revise their long-term strategies for making reasonable progress towards the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility in mandatory Class I Federal areas. The EPA is also proposing to approve portions of Illinois' September 29, 2017, and May 16, 2019, infrastructure SIP submissions for the 2012 fine particulate matter (PM<INF>2.5</INF>) and 2015 ozone National Ambient Air Quality Standards (NAAQS), respectively. The EPA is proposing that Illinois' infrastructure submissions fulfill CAA requirements for a State's SIP to contain adequate provisions prohibiting emissions that will interfere with required visibility protection measures in any other State's SIP.
The Environmental Protection Agency (EPA) is proposing to approve revisions and additions to Michigan Air Pollution Control Rules (MAPCR) Parts 6 and 8 for inclusion in the Michigan State Implementation Plan (SIP). Michigan submitted these SIP revisions to meet the Moderate Volatile Organic Compound (VOC) and Nitrogen Oxide (NO<INF>X</INF>) Reasonably Available Control Technology (RACT) requirements for the Western Michigan nonattainment areas (Berrien, Western portion of Allegan, and Western portion of Muskegon counties) under the 2015 ozone National Ambient Air Quality Standard (NAAQS or standard). The EPA is also proposing to approve MAPCR Rules that limit VOC emissions from consumer products and architectural and industrial maintenance coatings, as SIP strengthening measures for the Western Michigan nonattainment areas under the 2015 ozone standard. The Michigan Department of Environment, Great Lakes, and Energy (Michigan or EGLE) submitted the VOC SIP revisions on March 7, 2024, supplementing the submittal on May 2, 2024, and submitted the NO<INF>X</INF> SIP revisions on May 5, 2025, supplementing the submittal on August 6, 2025.
The Environmental Protection Agency (EPA) is proposing to determine under the Clean Air Act (CAA) that the Cleveland, Ohio nonattainment area (hereafter also referred to as "Cleveland area" or "area") has attained the 2015 ozone National Ambient Air Quality Standard (NAAQS or standard). This determination is based upon complete, quality-assured, and certified ambient air monitoring data for the 2023-2025 design period showing that the Cleveland area achieved attainment of the 2015 ozone NAAQS. This determination relies on an exceptional events request submitted by the Ohio Environmental Protection Agency (Ohio EPA) on December 8, 2025, which the EPA concurred with on January 12, 2026. The EPA is proposing to take final agency action on Ohio's exceptional events request and the EPA's concurrence. As a result of this determination, the EPA is proposing to suspend the requirements for the state to submit an attainment demonstration and associated Reasonable Available Control Measures (RACM), Reasonable Further Progress (RFP) plans, contingency measures for failure to attain or make reasonable progress, and other planning State Implementation Plans (SIPs) related to attainment of the 2015 NAAQS, for as long as the Cleveland area continues to attain the 2015 ozone NAAQS.
The Environmental Protection Agency (EPA) is proposing to determine under the Clean Air Act (CAA) that the Missouri portion of the St. Louis, MO-IL nonattainment area (hereafter also referred to, respectively, as the "St. Louis area" or "area") has achieved clean data for the 2015 ozone National Ambient Air Quality Standards (NAAQS or standard). This determination of clean data is based upon complete, quality-assured, and certified ambient air monitoring data for the 2023-2025 design value period showing that the Missouri portion of the area achieved attainment of the 2015 ozone NAAQS. The 2023-2025 design value relies upon EPA concurrence on a portion of the exceptional events request as submitted by the Missouri Department of Natural Resources (MoDNR) on November 3, 2025, and concurred on by the EPA on January 27, 2026. Therefore, the EPA is proposing to approve Missouri's November 3, 2025, Clean Data Determination (CDD) request. If finalized, this proposed CDD would suspend the obligations of the State of Missouri to submit certain nonattainment area planning requirements for as long as the Missouri portion of the St. Louis area continues to attain the 2015 ozone NAAQS. In a separate action, the EPA is proposing a similar determination for the Illinois portion of the St. Louis area.
The Environmental Protection Agency (EPA) is proposing to determine under the Clean Air Act (CAA) that the Illinois portion of the St. Louis, MO-IL nonattainment area (hereafter also referred to, respectively, as the "St. Louis area" or "area") has attained the 2015 ozone National Ambient Air Quality Standards (NAAQS or standard). This determination is based upon complete, quality-assured, and certified ambient air monitoring data for the 2023-2025 design value period showing that the Illinois portion of the area achieved attainment of the 2015 ozone NAAQS. This determination also relies on the EPA concurrence of an exceptional events request submitted by the Illinois Environmental Protection Agency (Illinois EPA) on December 18, 2025, and concurred on by the EPA on January 12, 2026. Therefore, the EPA is proposing to take final agency action on Illinois' exceptional events request. In a separate action, the EPA is proposing a similar determination for the Missouri portion of the St. Louis area. If finalized, this determination would suspend the requirements for the area to submit attainment demonstrations and associated Reasonably Available Control Measures (RACM), Reasonable Further Progress (RFP) plans, contingency measures for failure to attain or make reasonable progress, and other planning State Implementation Plans (SIPs) related to attainment of the 2015 ozone NAAQS, for as long as the area continues to attain the 2015 ozone NAAQS.
The Environmental Protection Agency (EPA) is approving a revision to the Michigan State Implementation Plan (SIP) as meeting the reasonable further progress (RFP) requirements of the Clean Air Act (CAA) for the Allegan County (partial county), Berrien County, and Muskegon County (partial county) Moderate nonattainment areas for the 2015 ozone national ambient air quality standard (NAAQS). The EPA is also approving updated 2017 base year emissions inventories and is finding adequate and approving the 2023 motor vehicle emissions budgets (budgets) associated with the Allegan County, Berrien County, and Muskegon County Moderate ozone nonattainment RFP demonstrations. The EPA is approving these portions of the State's SIP submission pursuant to section 110 and part D of the CAA, and EPA's regulations. The EPA proposed to approve this action on December 11, 2025, and received no adverse comments.
The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the State of Connecticut. This action consists of revisions to Regulations of Connecticut State Agencies (RCSA) sections 22a-174-22e and 22a-174-22f, primarily to add compliance dates for sources brought into the applicability of these sections due to a change in the definition of "severe non-attainment area for ozone." The definition change had previously been approved into Connecticut's SIP. This action is being taken in accordance with the Clean Air Act.
The Environmental Protection Agency (EPA) is approving revisions to the Ohio State Implementation Plan (SIP). On November 6, 2024, the Ohio Environmental Protection Agency (Ohio EPA) submitted the State's plans for maintaining the 2008 ozone National Ambient Air Quality Standard (NAAQS or standard) in the Columbus, Ohio; Cleveland- Akron-Lorain, Ohio; and Cincinnati, Ohio-Kentucky-Indiana areas. The EPA is approving these maintenance plans because they provide for the maintenance of the 2008 ozone NAAQS for each area for 10 additional years as required by the Clean Air Act (CAA). The EPA is also finding adequate and approving the motor vehicle emission budgets for each area. This approval makes certain commitments related to maintenance of the 2008 ozone NAAQS in these areas federally enforceable as part of the Ohio SIP.
The Environmental Protection Agency (EPA) is proposing to approve portions of Illinois' 2015 ozone National Ambient Air Quality Standard (NAAQS or standard) Moderate nonattainment area State Implementation Plan (SIP) submission for the Chicago and the Metro East St. Louis areas. The portions of the SIP submission that the EPA is proposing to approve are the reasonable further progress (RFP) demonstration including the associated motor vehicle emissions budgets for 2023, the motor vehicle inspection and maintenance (I/M) program, the nonattainment new source review (NNSR) program, and the updated 2017 base year emissions inventories. The EPA is proposing to approve these portions of the State's SIP submission pursuant to section 110 and part D of the Clean Air Act (CAA), and the EPA's regulations. The EPA is also initiating the adequacy process for the 2023 motor vehicle emissions budgets (budgets) for the Chicago and Metro East St. Louis Moderate ozone nonattainment RFP demonstration included in this SIP submission.
The Environmental Protection Agency (EPA or "the Agency") is proposing to approve a State implementation plan (SIP) revision submitted by the Commonwealth of Pennsylvania. In this rulemaking, the EPA proposes to approve a revision to the reasonably available control technology (RACT) Plan for the Philadelphia Gas Works, Richmond Plant (PGW Richmond), a major source of nitrogen oxides (NO<INF>X</INF>). The proposed revision would remove a condition from the RACT Plan Approval, previously incorporated into Pennsylvania's SIP on October 7, 2016. The proposed revision results in no change of emission allowances under RACT. This action is being taken under the Clean Air Act (CAA).
Pursuant to the Clean Air Act (CAA), the U.S. Environmental Protection Agency (EPA) is proposing to approve State Implementation Plan (SIP) submissions from eight States--Alabama, Arizona, Kentucky, Minnesota, Mississippi, Nevada, New Mexico, and Tennessee--regarding interstate transport for the 2015 8-hour ozone National Ambient Air Quality Standards (NAAQS). This action also explains why the EPA anticipates withdrawing previously proposed EPA error-correction actions related to interstate transport obligations for Iowa and Kansas and withdrawing previously proposed SIP disapproval actions for Tennessee, New Mexico, and Arizona. The "good neighbor" or "interstate transport" provision requires that each State's SIP contain adequate provisions to prohibit emissions from within the State from significantly contributing to nonattainment or interfering with maintenance of the NAAQS in other States. If finalized as proposed, this action would resolve these 10 States' obligations to eliminate significant contribution to nonattainment or interference with maintenance of the 2015 8-hour ozone NAAQS in other States.
The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the Commonwealth of Pennsylvania. This SIP revision addresses Clean Air Act (CAA) requirements for the enactment of a Basic vehicle emissions inspection and maintenance (I/M) program for the five counties comprising the Pennsylvania portion of the Philadelphia-Wilmington-Atlantic City, PA- NJ-MD-DE Moderate nonattainment area (Philadelphia nonattainment area) for the 2015 8-hour ozone national ambient air quality standards (NAAQS). The SIP revision demonstrates that Pennsylvania's existing I/M program in the Philadelphia nonattainment area meets applicable requirements for a Basic I/M program. The EPA is approving this SIP revision to the Pennsylvania SIP in accordance with the requirements of the Clean Air Act (CAA).
The Environmental Protection Agency (EPA) is proposing action related to the attainment date for the Kentucky portion of the Louisville, Kentucky-Indiana area (hereinafter referred to as the "Louisville, KY-IN Area" or "Area"). The Kentucky portion of this Area is classified as "Moderate" nonattainment for the 2015 ozone National Ambient Air Quality Standard (NAAQS), and the Indiana portion of this Area has been redesignated to attainment for this NAAQS. EPA is proposing to determine, with the consideration of exceptional events, that the Kentucky portion of the Louisville, KY-IN Area attained the standard by the applicable August 3, 2024, attainment date. This action, if finalized, will fulfill EPA's statutory obligation to determine whether the Kentucky portion of the Louisville, KY-IN Area attained the 2015 8-hour ozone NAAQS by the Moderate attainment date. As part of this rulemaking, EPA also proposes to take final agency action on the portion of an exceptional events request submitted by the Louisville Metro Air Pollution Control District (LMAPCD) on June 11, 2025, addressing six days in June 2023. EPA concurred on these six days on August 12, 2025. The proposed determination by the attainment date is based on EPA's partial concurrence on the exceptional events demonstration. This action is being taken under the Clean Air Act (CAA or Act).
The Environmental Protection Agency (EPA) is denying the request to redesignate the Kentucky portion of the Louisville, Kentucky-Indiana, 2015 8-hour ozone nonattainment area (hereinafter referred to as the "Louisville, KY-IN Area" or "Area") to attainment for the 2015 8-hour ozone National Ambient Air Quality Standards (NAAQS or standards). EPA is taking no action at this time on Kentucky's maintenance plan, including the regional motor vehicle emission budgets for nitrogen oxides (NO<INF>X</INF>) and volatile organic compounds (VOC) for the years of 2019 and 2035, submitted with Kentucky's redesignation request for the Louisville, KY-IN Area. The redesignation request and the maintenance plan state implementation plan (SIP) revision were submitted by the Commonwealth of Kentucky, through the Kentucky Energy and Environment Cabinet (Cabinet), Division for Air Quality (KDAQ), on September 6, 2022.
The Environmental Protection Agency (EPA) is proposing to determine that the Baltimore, Maryland nonattainment area (the Baltimore Area or the Area) has clean data for the 2015 8-hour ozone national ambient air quality standards (2015 ozone NAAQS or standard). This proposed clean data determination (CDD) under the EPA's Clean Data Policy is based upon quality-assured, quality-controlled, and certified ambient air quality monitoring data showing that the Baltimore Area has attained the 2015 ozone NAAQS based on 2022-2024 data available in the EPA Air Quality System (AQS) database. If finalized, this proposed CDD would suspend the obligations of the State of Maryland (MD) to submit certain attainment area planning requirements for as long as the Baltimore Area continues to attain the 2015 ozone NAAQS. As part of this rulemaking, the EPA also proposes to take final agency action on portions of exceptional events requests submitted by MD on February 2, 2024 and concurred on by the EPA on November 12, 2025. The proposed CDD is based upon the EPA's concurrence on portions of the exceptional events demonstrations. This action is being taken under the Clean Air Act (CAA).
The Environmental Protection Agency (EPA) is extending the comment period for a proposed rule that published January 2, 2026. The current comment period for the proposed rule was scheduled to close on February 2, 2026. The EPA is extending the comment period for the proposed action to February 9, 2026.
The Environmental Protection Agency (EPA) is approving 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. The EPA is approving 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") and as SIP strengthening for Ashtabula County and the Ohio portion of the Cincinnati, OH-KY maintenance area (Butler, Clermont, Hamilton, and Warren counties). The EPA is also approving Table (M)(1) in OAC rule 3745-21-07 into the SIP, with the exception of the row for The Ruscoe Company. Finally, the EPA is approving OAC rule 3745-15-03, submitted by Ohio on February 9, 2023, and supplemented on December 1, 2023, and December 30, 2024. The EPA proposed to approve this action on August 28, 2025 and received two comments.
The Environmental Protection Agency (EPA) is proposing to determine that the Riverside County (Coachella Valley) 1997 ozone Extreme nonattainment area ("Coachella Valley") attained the 1997 ozone national ambient air quality standards (NAAQS) by its June 15, 2025, attainment date. This proposed determination is based on quality- assured and certified ambient air quality monitoring data from 2022 through 2024. We are taking comments on this proposal and plan to follow with a final action.
Due to the receipt of an adverse comment, the Environmental Protection Agency (EPA) is withdrawing the November 20, 2025, direct final rule approving an element of a State Implementation Plan (SIP) submission from Michigan regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2015 ozone National Ambient Air Quality Standards (NAAQS).
U.S. Environmental Protection Agency (EPA or Agency) is approving a request to expand the boundary for the Northern Wasatch Front (NWF) 2015 8-hour ozone national ambient air quality standard (NAAQS) (2015 ozone NAAQS) nonattainment area (NAA). The request was submitted by the State of Utah on February 27, 2023. The newly expanded portion of the NWF NAA will have the same classification as the original NWF NAA under the 2015 ozone NAAQS and all applicable Clean Air Act (CAA) requirements will become applicable to the newly designated portion upon the effective date of the final action. The EPA is taking this action pursuant to the CAA.
The Environmental Protection Agency (EPA) is proposing to approve two separate requests from Maryland and Delaware to revise the designation for the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE nonattainment area (hereafter referred to as the Philadelphia nonattainment area) for the 2008 primary and secondary ozone national ambient air quality standards (NAAQS) and the 2015 primary and secondary ozone NAAQS. Due to the concurrent requests from Maryland and Delaware, the EPA is proposing to revise the existing Philadelphia nonattainment area boundary into three distinct nonattainment areas that together cover the identical geographic area of the existing area. The EPA is also proposing to issue clean data determinations (CDDs) for the revised Maryland and Delaware nonattainment areas for both the 2008 and 2015 ozone NAAQS. The EPA is taking this action pursuant to Clean Air Act (CAA) sections 107, 110, 172, and 182.
The Environmental Protection Agency (EPA) previously approved State Implementation Plan (SIP) revisions submitted by the State of Connecticut under the Clean Air Act (CAA) to address moderate area nonattainment requirements for the 2008 ozone standard for the Greater Connecticut and the Connecticut portion of the New York-Northern New Jersey-Long Island, NY-NJ-CT moderate ozone nonattainment areas. This rule does not change those previous EPA approvals; it merely corrects an error inadvertently introduced in a November 30, 2022, final rule by reinserting reference to EPA's previous approval of Connecticut's motor vehicle inspection and maintenance program certifications.
The Environmental Protection Agency (EPA) is proposing to approve revisions to the Michigan State Implementation Plan (SIP) as meeting the reasonable further progress (RFP) requirements of the Clean Air Act (CAA) for the Allegan County (partial county), Berrien County, and Muskegon County (partial county) Moderate nonattainment areas for the 2015 ozone national ambient air quality standard (NAAQS). EPA is also proposing to approve updated 2017 base year emissions inventories and is initiating the adequacy process and proposing approval of the 2023 motor vehicle emissions budgets (budgets) associated with the Allegan County, Berrien County, and Muskegon County Moderate ozone nonattainment RFP demonstrations. EPA is proposing to approve these portions of the State's SIP submission pursuant to section 110 and part D of the CAA, and EPA's regulations.
The Environmental Protection Agency (EPA) is proposing to approve a revision to the Indiana State Implementation Plan (SIP). On April 1, 2025, the Indiana Department of Environmental Management (IDEM) submitted a revision to the State's plan for maintaining the 2008 ozone National Ambient Air Quality Standard (NAAQS or standard) in the Indiana portion of the Cincinnati, Ohio-Kentucky-Indiana area. EPA is proposing to approve this maintenance plan because it provides for the maintenance of the 2008 ozone NAAQS for the area for 10 additional years as required by the Clean Air Act (CAA). EPA is also initiating the adequacy review process for motor vehicle emission budgets (Budgets) for the area. This action, if finalized, would make certain commitments related to maintenance of the 2008 ozone NAAQS in this area federally enforceable as part of the Indiana SIP.
The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Connecticut. This revision updates state regulations containing ambient air quality standards (AAQS) for ozone to be consistent with EPA's national ambient air quality standards (NAAQS). In addition, this update clarifies the volatile organic compound (VOC) calculation methods for adhesive and sealant products. The intended effect of this action is to propose approval of these regulations into the Connecticut SIP. This action is being taken under the Clean Air Act.
The Environmental Protection Agency (EPA) previously granted the State of Connecticut's request to reclassify the Greater Connecticut ozone nonattainment area from Moderate to Serious under the 2015 ozone National Ambient Air Quality Standards (NAAQS). That request, however, did not include areas governed by the Mashantucket Pequot Tribal Nation and the Mohegan Indian Tribe that are located within this nonattainment area. Given that ozone monitoring data indicate that the Greater Connecticut area failed to attain the 2015 ozone NAAQS by the applicable attainment date, we are proposing to find that these tribal portions of the area did not attain the standards by the attainment date and to reclassify those portions of the area by operation of law to Serious nonattainment for the 2015 ozone NAAQS. This action, if finalized as proposed, would fulfill the EPA's statutory obligation to determine whether the Mashantucket Pequot Tribal Nation and the Mohegan Indian Tribe portions of the Greater Connecticut area attained the NAAQS by the attainment date. This action also solicits public comment on EPA's prior action on CT DEEP's request to exclude event-influenced air quality monitoring data from regulatory decisions. EPA is required to provide an opportunity for public comment on the claimed exceptional events and all supporting data. This proposed action provides the public with an opportunity to comment on the claimed exceptional events, all supporting documents, and the EPA's July 22, 2024 concurrence and nonconcurrence with CT DEEP's request.
The Environmental Protection Agency (EPA) is proposing to approve the regional haze state implementation plan (SIP) revision submitted by Rhode Island on March 7, 2025, as satisfying applicable requirements under the Clean Air Act (CAA) and EPA's Regional Haze Rule (RHR) for the program's second implementation period. Rhode Island's SIP submission addresses the requirement that states must periodically revise their long-term strategies for making reasonable progress towards the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility, including regional haze, in mandatory Class I Federal areas. The SIP submission also addresses other applicable requirements for the second implementation period of the regional haze program. EPA is also proposing to approve the remaining element of Rhode Island's September 23, 2020, infrastructure SIP submittal for the 2015 ozone National Ambient Air Quality Standards (NAAQS). The proposed approval of Rhode Island's second implementation period regional haze plan addresses infrastructure SIP requirements related to visibility protection. The EPA is taking this action pursuant to sections 110 and 169A of the Clean Air Act.
The Environmental Protection Agency (EPA) is approving an element of a State Implementation Plan (SIP) submission from Michigan regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2015 ozone National Ambient Air Quality Standards (NAAQS). The infrastructure requirements ensure that the structural components of each State's air quality management program are adequate to meet CAA requirements. This action pertains to CAA section 110(a)(2)(E)(ii).
The Environmental Protection Agency (EPA) is approving an element of a State Implementation Plan (SIP) submission from Michigan regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2015 ozone National Ambient Air Quality Standards (NAAQS). The infrastructure requirements ensure that the structural components of each State's air quality management program are adequate to meet CAA requirements. This action pertains to CAA section 110(a)(2)(E)(ii).