The emission of toxic air pollutants (TAPs) creates potential or actual health problems for populations surrounding the emitting sources.^Prior to estimating the health and environmental impacts associated with the toxic pollutant emissions, an emission inventory must exist for an interested planning and regulatory agency to understand emission patterns and trends and to help the agency focus on certain pollutants and emission sources in its detailed inventory.^The Illinois Department of Energy and Natural Resources (ENR) has identified the need for a preliminary inventory of TAP emissions from industries and businesses within the State that could be used to define its air toxics problem, to identify potential control strategies, and to set priorities on subsequent data collection activities.^The Research Triangle Institute (RTI) was contracted by ENR`s Office of Research and Planning to establish such a preliminary emission inventory of TAPs and heavy metals emitted from Illinois industries and businesses.^The authors must emphasize that the final result of the work is a preliminary emission inventory that was generated based on best available information and data-bases, and by exercising engineering judgment.

"Printed: March 1990." "ILENR/RE-AQ-90/06." Includes bibliographical references (p. 77).