Midwest Research Institute (MRI), under contract to the United States Environmental Protection Agency (EPA), is currently revising Section 11.3, Bricks and Related Clay Products, of EPA's Compilation of Air Pollutant Emission Factors (AP-42). This paper presents an overview of the development of this AP-42 section and includes a discussion of the brick manufacturing process, emissions, an EPA-sponsored emission testing program, industry involvement in the project, and the development of revised emission factors that are proposed for publication. The paper also discusses some unanticipated results of the emission testing (the SO_2 emission measurements from a natural gas-fired kiln were significantly higher than SO_2 measurements from a coal-fired kiln) and the reasons for these results. Finally, some of the major differences in the current and proposed emission factors are highlighted, and the proposed emission factors are presented.
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