This project was initiated with the objective of providing a report describing state and local programs for controlling toxic air pollutants. The report is designed to serve as a resource for agencies who wish to develop air toxics control strategies. Studies were made of air toxics programs in Michigan, New Jersey, New York, Kentucky, Texas, California, Illinois, and Philadelphia. The report consists of a summary comparing the eight programs and a detailed description of each program. Development of all eight programs was initiated as a result of the recognition of potential adverse health effects resulting from exposure to toxic substances in the ambient air. The programs studied have four general functions in common: (1) air toxics control implemented via existing criteria pollutant permitting system, (2) collection of information on substances that will be emitted from sources being permitted, (3) determination of the quantity of toxic emissions allowable, and (4) conservation of agency resources in order to focus efforts on the most hazardous emissions of air toxics.