This report discusses the progress achieved during the first part of a two-phase systems study of nitrogen oxide control methods for stationary sources. A broad literature survey dealing with NOx emissions, potential control techniques, and pertinent technical information was completed. The literature survey was complemented by field survey contacts, which led to additional information on NOx emissionsn and control technique possibilities. For combustion sources, preliminary estimates for the U.S. showed about 55% of the current NOx emissions resulting from stationary sources. The contribution of power generation to uncontrolled stationary NOx emissions was projected to increase from 45% in 1965 to 57% in 1980 and 64% in 2000. Existing control technology for NOx emissions is quite limited. A number of potential NOx control methods have been identified. Combustion modification techniques have been found to be attractive because of their relative simplicity and low cost. These modifications of operating parameters and design features affect the factors influencing NOx emissions from combustion equipment, such as lowering peak flame temperature and the supply of oxygen. NOx control techniques by removal from stack gases have also been studied in detail. While the established technology is very limited, some methods have been identified which may provide simultaneous control of sulfur and nitrogen oxides if technical and economic feasibility can be demonstrated. (Author)