The paper discusses EPA/IERL-RTP R&D, underway since 1967, to advance combustion technology and the abatement and control of nitrogen oxides (NOx) and other combustion-generated pollutants from major stationary combustion sources. The primary air pollutants under consideration in the program, and for which control by combustion modification methods is feasible, are NOx, CO, hydrocarbons, carboraceous materials, particulates, and smoke. The development of improved technically feasible and cost-effective control methods will ensure the most efficient utilization of existing and available fossil fuels, especially coal, while simultaneously improving air quality. Technologies being developed and evaluated under this program should lead to environmentally acceptable utilization of available fossil fuels in a wider range of applications and should help ease the energy situation by allowing more widespread use of available fuels. To facilitate technology transfer and most practically to communicate recent combustion research results, EPA organized a three-day 'Symposium on Stationary Source Combustion' to address current concerns of those in the combustion field. The Symposium was held in Atlanta, Georgia, September 24 to 26, 1975.