This report surveys the status of NO/sub x/ control for stationary sources in Japan and analyzes applicability of the technology in the US. The principal control methods used in Japan are combustion modification and catalytic reduction using ammonia as the reducing agent. Noncatalytic reduction with ammonia is used to a limited degree. Wet scrubbing methods have been tested but are so unpromising that the development work has practically stopped. The combustion modification developments are applicable in this country but may not be any more effective than methods already under development in the US. Catalytic reduction is fully applicable for oil firing but for coal-fired boilers much more development work is needed to answer the several remaining questions. The needed research is presented in some detail. 16 figures.