Air and Radiation
This page shows all of the pages at www.epa.gov that are tagged with Air and Radiation.
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EPA Fulfills Statutory Obligation by Transmitting Four California Waiver Rules to Congress
In accordance with the Congressional Review Act, EPA transmitted four California waiver rules to Congress that have given the state the authority to enact its own emission standards for cars, trucks, lawn mowers and other equipment used daily.
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Trump EPA Proposes to Free States from Unnecessary Biden-era State Implementation Plan Requirements
EPA proposed revisions to portions of the Biden EPA’s January 2025 final rule, which required states to keep certain State Implementation Plan (SIP) requirements tied to an area's prior ozone nonattainment classification under the NAAQS.
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EPA Bolsters U.S. Steel Production in Minnesota
Today, U.S. Environmental Protection Agency (EPA) issued a final rule revising the Obama-era regional haze Federal Implementation Plan (FIP) for the United States Steel Corporation’s (U.S. Steel) Keetac taconite facility in Keewatin, Minnesota.
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EPA Splits Ozone Nonattainment Areas and Reduces Regulatory Burdens Across Parts of Maryland, Delaware
EPA approved Maryland and Delaware’s requests to redesignate Cecil County, Maryland, and New Castle County, Delaware, as separate ozone nonattainment areas (NAA) from the Philadelphia ozone NAA.
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EPA Proposes to Save Vital Coal Plant in Wyoming and Continue Production of Reliable Energy
U.S. Environmental Protection Agency (EPA) proposed to revise an Obama-era 2014 Wyoming regional haze Federal Implementation Plan (FIP) that would have forced the closure of the Dave Johnston Unit 3 power plant in Converse County, Wyoming.
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EPA Marks 500 Days of Trump Administration with Another 100 Top Environmental Actions
Administrator Zeldin Highlights Another Tranche of Environmental Victories as EPA Continues Powering the Great American Comeback
EPA Administrator Lee Zeldin announced 100 additional pro-environmental actions completed since the Trump EPA's one-year milestone, marking 500 days of delivering clean air, land, and water for all Americans under President Donald Trump's leadership.
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Administrator Lee Zeldin Visits with Energy Producers, Farmers in Oklahoma City
On Friday, May 29, U.S. Environmental Protection Agency (EPA) Administrator Lee Zeldin traveled to Oklahoma City, Oklahoma, for several events focused on the Trump Administration’s energy agenda and efforts to support American farmers.
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EPA Withdraws Biden-era 2023 Affirmative Defense Rule, Restoring Protections for Energy and Manufacturing Facilities
EPA withdrew the 2023 Biden EPA Affirmative Defense Rule to comply with a federal court mandate and restore longstanding protections for manufacturers, energy producers, and other facilities.
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EPA Cuts Biden-Era Refrigerant Rules, Saving Americans Over $2.4 Billion and Lowering Food Costs
EPA Administrator Lee Zeldin today announced two actions that together are estimated to save American families and businesses more than $2.4 billion, with savings expected to flow directly to consumers.
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EPA Partially Disapproves Hawaii’s Regional Haze Plan and Ensures the State’s Energy Needs Continue to Be Met
Today, U.S. Environmental Protection Agency (EPA) announced the partial approval and partial disapproval of Hawaii’s 2024 Regional Haze State Implementation Plan (SIP) revision.
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EPA Proposes to Delay Unattainable Biden-era Vehicle Standards, Projecting $1.7 Billion in Savings
EPA Administrator Lee Zeldin proposed another massive deregulatory action to restore consumer choice and make vehicles more affordable for all American families.
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EPA Issues Guidance on Streamlining Clean Air Act Title V Operating Permit Process to Expedite Approvals
EPA issued guidance clarifying the agency’s review process of Clean Air Act (CAA) title V permits to streamline and expedite approvals.
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EPA Proposes Approving North Carolina’s Plan to Remove Vehicle Emissions Testing Requirement in 19 Counties
On May 8, 2026, the U.S. Environmental Protection Agency (EPA) proposed to approve North Carolina’s request to remove its vehicle inspection and maintenance (I/M) program—commonly known as emissions testing—from the State Implementation Plan (SIP)
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EPA Proposes Redefining “Begin Actual Construction” to Remove Unnecessary Impediments to Building and Advance Economic Progress
EPA Administrator Lee Zeldin issued a proposal to clarify preconstruction permitting requirements and bring flexibility to building non-emitting components or structures.
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EPA Takes Action Against Two Northern California Landfills for Clean Air Act Violations, Minimizing Harmful Emissions
Today, U.S. Environmental Protection Agency (EPA) is announcing two settlements in the counties of Alameda and Sacramento, California to resolve claims of Clean Air Act (CAA) violations at the Altamont Landfill and Kiefer Landfill.
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Five Things to Know Following Administrator Zeldin’s Budget Hearings on Capitol Hill
EPA Administrator Lee Zeldin wrapped up congressional testimony before three committees regarding EPA’s Proposed Fiscal Year 2027 Budget.
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EPA Clarifies When Oil and Natural Gas Producers Can Flare After Phase Out Deadline
EPA issued guidance clarifying that current federal regulations allow oil and natural gas producers to continue routine flaring of associated gas at new oil wells in limited circumstances after the May 7, 2026, phase out deadline.
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EPA Responds to Michigan’s Request for Emergency Fuel Waivers Amid Widespread Flooding in Cheboygan County
U.S. EPA, in consultation with the U.S. Department of Energy and in accordance with the Clean Air Act, today issued a five-day emergency fuel waiver for Cheboygan County, Michigan, where widespread flooding has disrupted fuel deliveries in the region.
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Administrator Zeldin Wraps Up 6-Stop Nevada Swing
EPA Administrator Lee Zeldin spent three days in Nevada, for a variety of events focused on EPA equities in the state.
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EPA Deputy Administrator Fotouhi Visits Auto Supply Facilities in Southeast Michigan, Advances Key Agency Pillar
Earlier this week, EPA Deputy Administrator David Fotouhi traveled around Southeast Michigan to advance a key pillar of the Trump EPA’s Powering the Great American Comeback initiative—protecting and bringing back American auto jobs.