The core principle of fog gun is based on aerodynamics and cloud physics. The high pressure pump inside the device pressurizes the water, making it pass through a special fine nozzle at high speed, and the water is instantly crushed and atomized into tiny water droplets at the micron level. At the same time, the fan operates strongly, blowing out high-speed air, which is accurately sprayed to the designated area with fine water mist. These tiny water droplets have a large surface area and strong adhesion, and frequently collide and adsorb dust particles suspended in the air. Due to the weight of the attached water droplets, the dust can not continue to suspend, and then settle to the ground to achieve the effect of dust removal and air purification.