🌬️EPA Updates New York SIP Regulations
The Environmental Protection Agency (EPA) is updating the regulatory materials incorporated by reference into the New York State Implementation Plan (SIP). The regulations affected by this action have been previously submitted by the New York Department of Environmental Conservation (NYDEC) and approved by the EPA in prior rulemakings. The EPA is also notifying the public of corrections to the Code of Federal Regulations (CFR) tables that identify material incorporated by reference into the New York SIP. This update affects the materials that are available for public inspection at the EPA Regional Office.
Learn More🌫️Proposed Expansion of Northern Wasatch Front Ozone Nonattainment Area
The Environmental Protection Agency (EPA) is proposing to approve a request to expand the boundary for the Northern Wasatch Front (NWF) 2015 8-hour ozone national ambient air quality standard (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.
Learn More🚗Delaware's New Vehicle Emissions Regulation Impact on Businesses
The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the State of Delaware. The SIP revision addresses Clean Air Act (CAA) requirements for the enactment of a Basic vehicle emissions inspection and maintenance (I/M) program for the Delaware portion (i.e., New Castle County) of the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE Nonattainment Area (Philadelphia NAA) for the 2015 8-hour ozone national ambient air quality standards (NAAQS).
Learn More🌁Montana's Regional Haze Plan
The Environmental Protection Agency (EPA) is proposing to approve the regional haze state implementation plan (SIP) submission submitted by the State of Montana on August 10, 2022, under the Clean Air Act (CAA) and the EPA's Regional Haze Rule (RHR) for the program's second implementation period. Montana's 2022 SIP submission addresses the requirement that states revise their long-term strategies every implementation period to make 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. Montana's 2022 SIP submission also addresses other applicable requirements for the second implementation period of the regional haze program. The EPA is also proposing to approve the prong 4 visibility portion of Montana's October 1, 2018 Infrastructure SIP submission for the 2015 ozone National Ambient Air Quality Standards (NAAQS). The EPA is taking these actions pursuant to the CAA.
Learn More🌬️New Jersey EPA Approval of NOx SIP Requirements and Business Impact
The Environmental Protection Agency (EPA) is approving a revision in the New Jersey State Implementation Plan (SIP) that includes a signed Memorandum of Agreement (MOA) developed between the EPA and the New Jersey Department of Environmental Protection (NJDEP). The MOA demonstrates how the State will maintain compliance with its nitrogen oxides (NO<INF>X</INF>) emission control obligations for the types of large non-electricity generating units (non-EGUs) that were previously regulated under the New Jersey NO<INF>X</INF> Budget Program. This action is being taken in accordance with the requirements of the Clean Air Act (CAA).
Learn More🌫️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🌫️New EPA Rules Remove Affirmative Defense for Polyether Polyols Industry
The U.S. Environmental Protection Agency (EPA) is finalizing amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Polyether Polyols (PEPO) Production under the Clean Air Act (CAA). Specifically, for this NESHAP, the EPA is finalizing the removal of affirmative defense provisions associated with the violation of air emission standards due to malfunctions.
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 Finds Adequacy of Emissions Budgets for Klamath Falls
The EPA is notifying the public that we have found the motor vehicle emissions budgets for the Klamath Falls, Oregon 2006 24-hour fine particulate matter standard nonattainment area adequate for transportation conformity purposes. The budgets were submitted on August 20, 2024, as part of Oregon's Klamath Falls Redesignation Request and Maintenance Plan. As a result of our finding, the Klamath Falls area must use these budgets for future transportation conformity determinations.
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