The Office of Air and Radiation is under supervision of the Assistant Administrator for Air and Radiation who serves as principal adviser to the Administrator in matters pertaining to air and radiation programs, and is responsible for the management of these EPA programs: Program policy development and evaluation; environmental and pollution sources' standards development; enforcement of standards; program policy guidance and overview, technical support or conduct of compliance activities and evaluation of Regional air and radiation program activities; development of programs for technical assistance and technology transfer; and selected demonstration programs.

(a) Office of Mobile Sources. The Office of Mobile Sources, under the supervision of a Director, is responsible for the mobile source air pollution control functions of the Office of Air and Radiation. The Office is responsible for: Characterizing emissions from mobile sources and related fuels; developing programs for their control, including assessment of the status of control technology and in-use vehicle emissions; for carrying out, in coordination with the Office of Enforcement and Compliance Monitoring as appropriate, a regulatory compliance program to ensure adherence of mobile sources to standards; and for fostering the development of State motor vehicles emission inspection and maintenance programs.

(b) Office of Air Quality Planning and Standards. The Office of Air Quality Planning and Standards, under the supervision of a Director, is responsible for the air quality planning and standards functions of the Office of Air and Radiation. The Director for Air Quality Planning and Standards is responsible for emission standards for new stationary sources, and emission standards for hazardous pollutants; for developing national programs, technical policies, regulations, guidelines, and criteria for air pollution control; for assessing the national air pollution control program and the success in achieving air quality goals; for providing assistance to the States, industry and other organizations through personnel training activities and technical information; for providing technical direction and support to Regional Offices and other organizations; for evaluating Regional programs with respect to State implementation plans and strategies, technical assistance, and resource requirements and allocations for air related programs; for developing and maintaining a national air programs data system, including air quality, emissions and other technical data; and for providing effective technology transfer through the translation of technological developments into improved control program procedures.

(c) Office of Radiation Programs. The Office of Radiation Programs, under the supervision of a Director, is responsible to the Assistant Administrator for Air and Radiation for the radiation activities of the Agency, including development of radiation protection criteria, standards, and policies; measurement and control of radiation exposure; and research requirements for radiation programs. The Office provides technical assistance to States through EPA Regional Offices and other agencies having radiation protection programs; establishes and directs a national surveillance and investigation program for measuring radiation levels in the environment; evaluates and assesses the impact of radiation on the general public and the environment; and maintains liaison with other public and private organizations involved in environmental radiation protection activities. The Office coordinates with and assists the Office of Enforcement and Compliance Monitoring in enforcement activities where EPA has jurisdiction. The Office provides editorial policy and guidance, and assists in preparing publications.