[en] The objective of this project is to develop an environmentally acceptable and cost-effective NO(sub x) control system that can achieve less than 0.15 lb NO(sub x)/10(sup 6) Btu for a wide range of coal-burning commercial boilers. The system will be comprised of an ultra low-NO(sub x) PC burner technology plus a urea-based, selective non-catalytic reduction (SNCR) system. In addition to the above stated NO(sub x) limit of 0.15 lb NO(sub x)/10(sup 6) Btu, ammonia (NH(sub 3)) slip levels will be targeted below 5 ppmV for commercial units. Testing will be performed in the 100 million Btu/hr Clean Environment Development Facility (CEDF) in Alliance, Ohio. Finally, by amendment action, a limited mercury measurement campaign was conducted to determine if the partitioning and speciation of mercury in the flue gas from a Powder River Basin coal is affected by the addition of Chlorides to the combustion zone