About the Office of Air and Radiation

Related Information
OAR Press Releases

What We Do

The Office of Air and Radiation develops national programs, policies, and regulations for controlling air pollution and radiation exposure. OAR is concerned with:
  • acid rain
  • climate change
  • energy efficiency
  • indoor and outdoor air quality
  • industrial air pollution
  • pollution from vehicles and engines
  • radiation protection
  • radon
  • renewable energy
  • stratospheric ozone depletion

OAR is responsible for administering the Clean Air Act, the Atomic Energy Act, the Waste Isolation Pilot Plant Land Withdrawal Act, the American Innovation and Manufacturing Act, the Inflation Reduction Act, Bipartisan Infrastructure Law, Climate Pollution Reduction Grants Program, and other applicable environmental laws and programs.

Organization

Sarah Dunham, Director of the Office of Transportation and Air Quality, performing delegated duties as the Assistant Administrator for the Office of Air and Radiation
Abigale Tardif, Principal Deputy Assistant Administrator
Elizabeth Shaw, Deputy Assistant Administrator
Alexander Dominguez, Deputy Assistant Administrator for Mobile Sources
Pat Childers, Senior Tribal Program Coordinator

The Office of Air and Radiation includes:

Office of Air Quality Planning and Standards

What We Do

OAQPS’s primary mission is to preserve and improve air quality in the United States. To accomplish this, OAQPS:
  • compiles and reviews air pollution data,
  • develops regulations to limit and reduce air pollution,
  • assists states and local agencies with monitoring and controlling air pollution,
  • makes information about air pollution available to the public, and
  • reports to Congress the status of air pollution and the progress made in reducing it.

Programs and projects managed by the Office of Air Quality Planning and Standards

Mail code: C404-04 | EPA mailing addresses
Location: Research Triangle Park, North Carolina

OAQPS Organization

Peter Tsirigotis, Director
  • Phone: (919) 541-5616
OAQPS includes:

Office of Atmospheric Protection

What We Do

OAP is responsible for developing and implementing national and international programs related to restoring the stratospheric ozone layer, reducing interstate transport of air pollution, increasing energy efficiency and the use of clean energy, and understanding and addressing climate change. OAP both develops and implements its regional, national, and international programs alongside stakeholders from most economic sectors in the U.S., including commercial and residential buildings, the power sector, commercial products manufacturers and retailers, energy producers and distributers, and more.

Programs and projects managed by the Office of Atmospheric Protection

Mail code: 6201A | EPA mailing addresses
Location: EPA Headquarters in Washington, D.C.

OAP Organization

Paul Gunning, Director
  • Phone: (202) 343-9736
OAP includes:

Office of Transportation and Air Quality

What We Do

OTAQ’s mission is to  protect human health and the environment by reducing air pollution and greenhouse gas emissions from mobile sources and the fuels that power them, advancing clean fuels and technology, and encouraging business practices and travel choices that minimize emissions. OTAQ’s programs address emissions from the range of mobile sources:  cars and light trucks, large trucks and buses, farm and construction equipment, lawn and garden equipment, marine engines, aircraft, and locomotives.

OTAQ's primary activities include:
  • Assessing mobile source-related air quality problems and developing sophisticated modeling tools to develop solutions, measure results, and support emission inventories.
  • Establishing national standards to reduce emissions from on-road and nonroad mobile sources of pollution.
  • Implementing national mobile source standards through certification processes and in-use monitoring strategies.
  • Developing fuel efficiency programs and technologies to reduce the emission of greenhouse gases from the transportation sector.
  • Researching, evaluating, and developing advanced technologies for controlling emissions, as well as developing new strategies for improving fuel efficiency.

OTAQ's National Vehicle and Fuel Emissions Laboratory provides OTAQ with emissions testing services in support of rulemakings, certification, enforcement actions, and test procedures development.

Programs and projects managed by the Office of Transportation and Air Quality 

Mail code: 6401A | EPA mailing addresses
Location: EPA Headquarters at Washington, D.C.

OTAQ organization chart

OTAQ Organization

Sarah Dunham, Director
  • Phone: (202) 564-1682
OTAQ includes:
  • Assessment and Standards Division
    Bill Charmley, Director
    • Phone: (734) 214-4466
  • Implementation, Analysis and Compliance Division
    Byron Bunker, Director
    • Phone: (734) 214-4155
  • Testing and Advanced Technology Division
    David Haugen, Director
    • Phone: (734) 214-4366
  • Transportation and Climate Division
    Karl Simon, Director
    • Phone:  (202) 564-7918

Office of Radiation and Indoor Air

What We Do

ORIA’s mission is to protect the public and the environment from the risks of radiation and indoor air pollution. The office coordinates across the Agency and with other federal, state, tribal, and non-governmental organizations to carry out its mission. ORIA develops criteria, standards, guidance, policies, and programs to limit unnecessary radiation exposure and control exposure to indoor air pollutants.  The office:
  • Provides technical assistance to states and tribes through EPA's Regional offices, and to other national and international organizations having radiation and indoor air protection programs.
  • Directs an environmental radiation monitoring program.
  • Responds to radiological emergencies.
  • Evaluates and assesses the overall risk and impact of radiation and indoor air pollution.

Programs and projects managed by the Office of Radiation and Indoor Air

Mail code: 6608T | EPA mailing addresses
Location: EPA Headquarters at Washington, D.C.

ORIA Organization

Jonathan Edwards, Director
  • Phone: (202) 343-9320
The Office of Radiation and Indoor Air includes:

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Last updated on March 26, 2025