Nitric acid is one of the most common mineral acids in the chemical Industry. It is produced by high-temperature oxidation of ammonia with oxygen catalyzed by a platinum/rhodium contact. Nitrogen oxides are major pollutants in the atmosphere, being a precursor to acid rain, photochemical smog, and ozone accumulation. The oxides are mainly nitric oxide (NOx) and nitrogen dioxide (NO2) both of which are corrosive and hazardous to health. With the use of catalytic converters, the focus of controlling NOx emissions has become economically impractical. Consequently, the stationary sources of NOx emissions are now being subjected to more stringent standards in many countries. The sources include nitric acid manufacturing plants, manufacturers of nitrated materials such as fertilizer and explosives, and industrial manufacturers, metallurgical processors, glass manufacturers, cement kilns, and power generators where high processing temperatures are used. Because of the environmental concerns posed by air pollution, it is important to design and implement a scrubber system for controlling NOx emissions.