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In recent years, fog haze and other air pollution have already done great harm to people’s health, as well as traffic and the environment. A new study finds out that aerial water spray is the best way to control fog haze, as water droplets can take particulate matter from the air to the ground. City Guardian is a city cleaning system with the main function of aerial water spray. It helps to control fog haze of the city with the storage of rainfall and solar energy, and adjust the temperature and humidity around. It is a public installation, composed of a bionic tree and dozens of water-spray drones.