🌫️EPA Approves San Joaquin Valley Ozone Maintenance Plan
The Environmental Protection Agency (EPA) is taking final action to approve the "2023 Maintenance Plan and Redesignation Request for the Revoked 1-Hour Ozone Standard" ("San Joaquin Valley Maintenance Plan" or "Plan") as a revision to the state implementation plan (SIP) for the State of California. The San Joaquin Valley Maintenance Plan includes, among other elements, an emissions inventory consistent with attainment and contingency provisions. The EPA is also finalizing its finding that the State of California's request to redesignate the San Joaquin Valley area from nonattainment to attainment for the revoked 1979 1-hour national ambient air quality standard (NAAQS or "standard") for ozone ("1979 ozone NAAQS," "1-hour ozone NAAQS," or "1-hour ozone standard") meets all the Clean Air Act (CAA or "the Act") criteria for redesignation. Therefore, the EPA is terminating all anti-backsliding obligations for the San Joaquin Valley area for the revoked 1-hour ozone NAAQS.
Learn More🌫️EPA Approves Missouri's Revised State Implementation Plan for Air Quality
The Environmental Protection Agency (EPA) is taking final action to approve revisions to the State Implementation Plan (SIP) for the State of Missouri related to Definitions and Common Reference Tables used in Missouri rules. EPA has also previously approved this rule as part of the air planning and permitting program. Some of the definitions are associated with those programs, even though many of the definitions pertain only to the SIP. These revisions do not impact the stringency of the SIP or have an adverse effect on air quality. The EPA's final approval of this rule revision is being done in accordance with the requirements of the Clean Air Act (CAA).
Learn More🌬️Approval of West Virginia Air Quality Standards by EPA
The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the State of West Virginia. This revision updates West Virginia's incorporation by reference (IBR) of EPA's national ambient air quality standards (NAAQS) and the associated monitoring reference and equivalent methods. EPA is approving these revisions to the West Virginia SIP in accordance with the requirements of the Clean Air Act (CAA).
Learn More🌫️EPA Approves Washington Regional Haze SIP
The Environmental Protection Agency (EPA) is approving the regional haze State implementation plan (SIP) revision, submitted by Washington on January 28, 2022, to address applicable requirements under the Clean Air Act (CAA) and the EPA's Regional Haze Rule (RHR) for the regional haze program's second implementation period.
Learn More🚗Proposed Revisions to Oregon's Vehicle Inspection Program 2024
The Environmental Protection Agency (EPA) proposes to approve revisions to the Oregon State Implementation Plan (SIP) submitted by the Oregon Department of Environmental Quality on April 3, 2025. The SIP revision updates rules for the Vehicle Inspection Program (VIP) which is applicable in the Portland and Medford areas, and includes a demonstration that the requested revisions will not interfere with attainment or maintenance of any national ambient air quality standard (NAAQS) or with any other applicable requirement of the Clean Air Act (CAA or Act).
Learn More🌬️Wyoming Air Quality Standards Revised by EPA
The Environmental Protection Agency (EPA) is taking direct final action to approve revisions to the Wyoming State Implementation Plan (SIP) submitted by the Wyoming Department of Environmental Quality (WDEQ) on December 16, 2024. WDEQ requested the EPA approve the revised rules for Chapters 2, 3, 4, 8, and 14 in the Wyoming Air Quality Standards and Regulations (WAQSR). The revised rules include non- substantive updates to rule language that ensure consistent grammar, formatting, and written clarity as well as updated references to the Code of Federal Regulations (CFR). The EPA is taking this action pursuant to the Clean Air Act (CAA).
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🌍Business Implications of California's Carbon Monoxide SIP Revision
The Environmental Protection Agency (EPA) is taking final action to approve a revision to the California state implementation plan (SIP) that removes carbon monoxide (CO) contingency measures and monitoring requirements from the maintenance plan for three CO maintenance areas: Chico Urbanized Area, Modesto Urbanized Area, and Stockton Urbanized Area. We are approving the revision under the Clean Air Act (CAA or "Act").
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🌬️Georgia Eases Air Quality Permitting Requirements for Businesses
The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Georgia through the Georgia Environmental Protection Division (EPD) on June 27, 2024. The revision seeks to remove permitting requirements related to nonattainment, including nonattainment new source review (NNSR), from Georgia's SIP as obsolete, remove certain provisions related to the use of emission reduction credits (ERCs), and make other changes based upon the lack of any areas designated as nonattainment for the National Ambient Air Quality Standards (NAAQS) in Georgia. EPA is proposing to approve these changes pursuant to the Clean Air Act (CAA or Act).
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