AMS-100 Zero Gas Generator is one of the quality control equipment of the ambient air quality monitoring system. Its components include pressure flow controller, water removal system, SO2, NO, NO2, O3, and H2S remover, and CO and hydrocarbon remover. The zero gas generator is based on the principles of adsorption, filtration, and reaction to remove SO2, NO, NO2, O3, H2S, NH3, hydrocarbons, and particles in the air and output dry and clean air. The water removal system inside the instrument can remove the moisture in the air and produce air lower than the dew point of – 20℃, which is not affected by the dew point of inlet air. It also helps to remove other gases and greatly prolongs the service life of the chemical remover.