The report summarizes the existing data base on NOx, SO2, and particulate emissions from combustion sources burning coal/oil mixtures (COMs). The need for the U.S. to reduce its dependence on oil and expand its use of coal has prompted a number of industrial and utility energy producers to investigate converting their sites from the exclusive combustion of oil to combustion of COMs. Under contract to EPA and DOE, Radian has identified and evaluated emission control technologies that could be retrofitted to boilers to control criteria and non-criteria air pollutants. The report also gives emissions data for the trace elements As, Be, Cd, Cr, Hg, Ni, Se, and V. It identifies control techniques that can reduce the emissions of these pollutants. These techniques are assessed for their efficiency to reduce the emissions from COM combustion to levels representative of oil firing. Capital costs, operating expense, and overall lifecycle costs are also discussed.