Fuel Tech, Inc. develops, commercializes, and applies technologies for air pollution control, process optimization, water treatment, and advanced engineering services. It serves utility and industrial customers in the United States, the rest of the Americas, Europe, South Africa, the Pacific Rim, and internationally. The Air Pollution Control Technology segment offers technologies to reduce nitrogen oxide (NOx) emissions from stationary combustion sources, including NOxOUT selective non-catalytic reduction and selective catalytic reduction systems, electrostatic precipitator processes, ULTRA technology, urea direct injection systems, and flue gas conditioning systems. The FUEL CHEM Technology segment provides chemical injection programs to improve efficiency, reliability, fuel flexibility, boiler heat rate, and environmental status of combustion units by controlling slagging, fouling, corrosion, opacity, and acid plume, as well as the formation of sulfur trioxide, ammonium bisulfate, particulate matter, sulfur dioxide, and carbon dioxide. It also offers dissolved gas infusion systems and visualization software. Fuel Tech was incorporated in 1987 and is headquartered in Warrenville, Illinois.