The paper discusses EPA's Control Technology Center (CTC), including the technical support it provides to federal, state, and local agencies. In June 1985, the U.S. EPA announced an Air Toxics Strategy to reduce public exposure to toxic pollutants in ambient air. The Strategy addressed both routine and accidental releases and coupled responsibilities of traditional federal regulatory development and implementation programs with those of the states. The shift in regulatory roles towards state and local agencies resulted in the realization that a transfer of technical expertise and knowledge to those governmental sectors would be required, involving the significant technical resource that has been developed within the technical staffs of EPA's air regulatory programs and research offices. To facilitate that transfer of technical expertise and knowledge to state and local government agencies, the Control Technology Center was formed in 1987, as a collaborative effort between EPA's Office of Air Quality Planning and Standards (Emission Standards Division) and Office of Research and Development (Air and Energy Engineering Research Laboratory).