The Air Risk Information Support Center (Air RISC) has been organized by U.S. EPA's offices of Air Quality Planning and Standards and Health and Environmental Assessment. The center has been developed in cooperation with the State and Territorial Air Pollution Control Program Administrators and the Association of Local Air Pollution Control Officials. These officials are encouraged to contact Air RISC for assistance in obtaining health, exposure and risk assessment information on toxic air pollutants. Questions may be telephoned in via a Hotline and are referred to an appropriate EPA expert who will attempt to provide the information requested. EPA Health Assessment Documents, risk information databases, and other appropriate sources are used to provide rapid, scientifically-valid information. Technical assistance (defined as more in-depth review of a particular air toxics problem) is also provided, typically when there is no existing health documentation on a particular air toxic or when the requesting office needs assistance in reviewing risk assessment information provided to it. When there is a demonstrated need, Air RISC will provide technical guidance in the form of documents and workshops on health risk assessment methodology and toxicology. In each of these forms of assistance, it is anticipated that valuable lines of communication will be established between air toxics control officials and the EPA staff involved in the program.