The report is the fourth and final volume in a series documenting research activities under the EPA's Fundamental Combustion Research (FCR) program applied to pollution formation. The FCR program had three major objectives: (1) to generate an understanding of combustion behavior necessary to help develop control strategies to minimize NOx emissions from stationary sources; (2) to develop engineering models which would allow effective utilization of a large body of fundamental information in the development of new NOx control techniques; and, (3) to identify critical information necessary for low-NOx combustor development and to generate it in a time frame consistent with the needs of EPA's technology development programs.