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 Issues Permitting Guidance to Further President Trump’s Agenda Promoting Data Centers and Safeguarding Communities
This month, EPA issued guidance clarifying that the Clean Air Act Acid Rain Program does not apply to power generation facilities that are not connected to a public electricity grid, commonly referred to as “islanded” power generation facilities.
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EPA Proposes Ozone Redesignations in Michigan for Muskegon County, Berrien County, and Detroit Area After Significant Pollution Reductions
U.S. Environmental Protection Agency (EPA) proposed redesignating Muskegon County, Berrien County, and the Detroit, Michigan region, as in “attainment” for national ground-level ozone standards, following years of significant pollution reductions.
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EPA Again Fulfills Its Statutory Obligation by Transmitting Two Additional California Waiver Rules to Congress
In accordance with the Congressional Review Act, EPA transmitted two more California waiver rules to Congress that have given the state the authority to enact its own emission standards for marine vessels and ports critical to America’s supply chain.
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EPA Grants Marine Engine Exemption to Support New England's Lobster Industry and Economic Growth
Today, U.S. Environmental Protection Agency (EPA) is exempting a specific new lobster boat model in Chatham, Massachusetts, from Tier 4 engine requirements in accordance with the agency’s authority.
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ICYMI: Across the Board Coverage of the Trump EPA’s Proposal to Save American Truckers Billions and Remove DEF Deratements Entirely
Last week, at the Great American State Fair on the National Mall, EPA Administrator Lee Zeldin unveiled a proposal to reverse the unattainable 2023 NOx emission reduction provisions created under the Biden Administration.
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Trump EPA Unveils Proposal to Save Truckers $12 Billion by Revising Unworkable Biden-Era Rule
Agency Proposes to Eliminate DEF Deratements Entirely
EPA Administrator Lee Zeldin announced a proposal estimated to save American truckers $12 billion through commonsense revisions to unnecessary and unworkable Biden-era compliance requirements.
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What They Are Saying: U.S. Leaders, American Automakers and Consumers Cheer EPA’s Implementation of President Trump’s “Freedom To Fix” Memo, Greenlighting SEMA’s Certification of Aftermarket Products
Here’s what people are saying about EPA’s implementation of President Trump’s “Freedom To Fix” memo and the greenlighting of SEMA’s certification of aftermarket products.
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EPA Proposes to Streamline State and Local Permitting Process for Minor Sources
EPA proposed a rule to streamline the New Source Review (NSR) permitting process for minor sources by eliminating the minimum federal regulatory requirements for public participation.
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EPA Delivers on President’s “Freedom to Fix” Memorandum for Vehicles and Equipment
Today, pursuant to President Trump’s directive in the Presidential Memorandum, “Lowering the Cost of Living by Promoting the Freedom to Fix,” EPA is advancing the freedom to fix for all Americans, regardless of vehicle or equipment type.
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EPA Implements New “Freedom to Fix” Presidential Memorandum; Gives SEMA Greenlight to Certify Aftermarket Products
Today, EPA took action by recognizing the Specialty Equipment Market Association (SEMA) as an alternative certification authority for aftermarket vehicle parts.
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EPA Issues Permitting Guidance on Obtaining Emission Reduction Credits
Today, U.S. Environmental Protection Agency (EPA) issued guidance clarifying how permitting authorities may apply emission reduction credit (ERC) requirements under the Nonattainment New Source Review (NNSR) preconstruction permitting program.
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EPA Releases Tools to Assist Air Agencies in Exceptional Events Demonstrations
EPA released three enhanced user-friendly tools to help state, local, and Tribal air agencies expedite, develop, and prepare demonstrations of exceptional events.
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EPA redesignates Cleveland area to “attainment” for ozone; area now meets air quality standards
Decision comes after more than a 40% decrease in pollutants over eight years
Today, U.S. Environmental Protection Agency (EPA) announced the Cleveland, Ohio, area is now in “attainment” for ground-level ozone based on years of air monitoring data showing the region meets the national standard set in 2015.
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EPA Clears Over Two Decades of State Implementation Plan Backlogs in Oklahoma
Today, U.S. Environmental Protection Agency (EPA) cleared over two decades of backlogged State Implementation Plans (SIPs) in Oklahoma by acting on 13 SIP revisions submitted between 2002 and 2025.
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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.