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 redesignates Detroit area to “attainment” for sulfur dioxide; area now meets national air quality standards
Cleaner air for Detroit as sulfur dioxide levels drop more than 57% over 15 years
U.S. Environmental Protection Agency (EPA) is announcing the redesignation of the Detroit area to “attainment” for sulfur dioxide emissions after air monitoring shows the region meets the national health-based standard.
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ICYMI: EPA’s New Guidance Removes Requirement for Diesel Exhaust Fluid (DEF) Sensors, Saves American Operators Billions
On Friday, March 27, 2026, President Trump announced U.S. EPA Administrator Lee Zeldin has issued new guidance making it clear DEF sensors are no longer required, and NOx sensors can be used instead to meet regulatory requirements.
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What They Are Saying: Leaders Across America Commend EPA’s Action to Finalize Historic Renewable Fuel Standards and Support America’s Rural Communities
On Friday, March 27, 2026, at the White House Great American Agriculture Celebration on the South Lawn, President Trump announced that U.S. Environmental Protection Agency (EPA) has finalized the historic Renewable Fuel Standard (RFS) “Set 2” final rule.
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Trump Administration Announces Latest Action to Address Diesel Exhaust Fluid (DEF) System Complaints, Saves American Farmers and Truckers Over $13 Billion Annually
EPA Removes DEF Sensor Requirements Saving Americans Billions Annually and Countless Hours of Lost Time and Productivity
EPA Administrator Lee Zeldin has taken to address nationwide concerns from farmers, truckers, motor coach operators, and other diesel equipment operators regarding Diesel Exhaust Fluid (DEF) system failures.
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EPA Finalizes Historic New Renewable Fuel Standards to Strengthen American Energy Security, Support Rural Economies
Rule sets balanced biofuels growth for 2026 and 2027, bolstering domestic oil and feedstock
Today at the White House Great American Agriculture Celebration, President Trump announced that U.S. Environmental Protection Agency (EPA) has finalized the historic Renewable Fuel Standard (RFS) “Set 2” final rule.
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What They are Saying: EPA Fortifies Domestic Fuel Supply, Provides Americans with Relief at the Pump by Approving Nationwide E15 and Removing Boutique Fuel Markets for E10
EPA Administrator Lee Zeldin, in consultation with U.S. Department of Energy (DOE) and in accordance with the Clean Air Act (CAA), issued a temporary emergency fuel waiver to allow nationwide sales of E15 and E10 fuels.
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EPA Fortifies Domestic Fuel Supply, Provides Americans with Relief at the Pump by Approving Nationwide E15 and Removing Boutique Fuel Markets for E10
EPA Administrator Lee Zeldin, in consultation with DOE and in accordance with the Clean Air Act (CAA), issued a temporary emergency fuel waiver to allow nationwide sales of E15 and E10 gasoline ethanol.
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EPA Determines Phoenix-Mesa Area Will Not Be Unfairly Punished for International Emissions
Agency Finalizes Use of Clean Air Act International Transport Provision to Prevent Phoenix-Mesa from a Higher Non-Attainment Determination
EPA finalized its determination to not reclassify the Phoenix-Mesa area from Moderate to Serious nonattainment under the 2015 Ozone National Ambient Air Quality Standards (NAAQS).
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EPA Expedites Review of Requests from New Hampshire Under the Clean Air Act
EPA News Release: EPA Expedites Review of Requests from New Hampshire Under the Clean Air Act
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Administrator Zeldin Announces Proposal to Streamline Permitting Requirements for Incinerators Critical to Wildfire Prevention and Natural Disaster Recovery
U.S. EPA Administrator Lee Zeldin issued a proposal to harmonize existing Clean Air Act (CAA) regulations and cut red tape for incinerators to help state, local, and Tribal governments prevent and respond to natural disasters.
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EPA Releases Proposal for Commercial Sterilizers to Safeguard the Supply of Life-Saving Medical Tools
EPA has proposed amendments to the Biden-era 2024 National Emissions Standards for Hazardous Air Pollutants (NESHAP) for Ethylene Oxide (EtO) Commercial Sterilization Facilities to ensure consistency with the law.
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Administrator Zeldin Announces Selection of Members to the Clean Air Scientific Advisory Committee
Today, U.S. Environmental Protection Agency (EPA) Administrator Lee Zeldin announced the selection of new members to the Clean Air Scientific Advisory Committee (CASAC).
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ICYMI: Breitbart Exclusive: EPA Chief Lee Zeldin Ends Democrat War on ‘Beautiful, Clean Coal’
Breitbart News highlighted a key action the EPA is taking to ensure affordable, dependable energy for American families and restore American energy dominance.
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EPA Issues Guidance Update on Regional Haze Plans for States to Ensure Reliability of the American Electric Grid
EPA issued a memorandum clarifying guidance on Regional Haze State Implementation Plans (SIPs) to support the reliability of our electric grid.
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EPA Continues to Reverse Democrats’ War on Beautiful Clean Coal, Finalizes Repeal of Costly Restrictions on Baseload Power Generation
While at Mills Creek Power Plant in Kentucky, U.S. Environmental Protection Agency (EPA) announced the finalization of a deregulatory action to ensure affordable, dependable energy for American families and restore American energy dominance.
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ICYMI: New York Post: EPA to Reform Biden’s $5B Electric School Bus Program by Providing More Fuel Alternatives
The Environmental Protection Agency is revamping the Clean School Bus (CSB) Program.
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EPA Announces Path Forward to Revamp the Clean School Bus Program to Provide Safe, Affordable, Efficient Transportation for America’s Youth
Seeks Public Input to Reform the Program to Ensure Best Use of Taxpayer Dollars and Deliver Results for American Families
Today, U.S. Environmental Protection Agency (EPA) announced the path forward to revamp the Clean School Bus (CSB) Program to provide school districts with increased choice and affordable options for school buses.
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What They Are Saying: Leaders and Americans Across the Country Applaud the Single Largest Act of Deregulation in U.S. History
On Thursday, February 12, 2026, alongside President Trump in the White House’s Roosevelt Room, U.S. Environmental Protection Agency (EPA) Administrator Lee Zeldin announced the single largest deregulatory action in U.S. history.
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President Trump and Administrator Zeldin Deliver Single Largest Deregulatory Action in U.S. History
Trump Admin Eliminates Obama-Era Endangerment Finding, off-cycle credits, start-stop feature
Alongside the President, EPA Administrator Lee Zeldin announced the single largest deregulatory action in U.S. history.
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Administrator Zeldin Eliminates Off-Cycle Credit for Almost Universally Hated Start-Stop Feature in Vehicles
EPA Administrator Lee Zeldin eliminated the off-cycle credit that was used to implement the almost universally hated start-stop feature in American vehicles.