Device and method for managing fine particle concentration

A device installed in open space for managing a concentration of fine particles in a target region in the open space by supplying electrons to the target region, the device comprising:

• a container configured to store water;
• at least one nozzle configured to output the water to the open space;
• a pump configured to supply the water from the container to the at least one nozzle;
• a power supply configured to supply power to the device;
• and
• a controller configured to apply a negative voltage to the at least one nozzle by using the power supply such that:
• the electrons are supplied to the target region in the open space by providing negatively charged droplets through the at least one nozzle, and
• electrical field is formed between the at least one nozzle and a surrounding terrain feature where the device is installed, wherein the surrounding terrain feature functions as a counter electrode of the at least one nozzle,
• wherein the controller is configured to:
• apply the negative voltage equal to or greater than a first reference value to the at least one nozzle, wherein the applying of the negative voltage equal to or greater than the first reference values to the at least one nozzle allows the concentration of the fine particles in the target region to be decreased to a reference ratio within a reference time period,
• supply the stored water from the container to the at least one nozzle such that the stored water is transformed into negatively charged droplets, and
• provide the negatively charged droplets to the target region in the open space through the at least one nozzle, allowing the fine particles existing in the target region to be negatively charged such that the fine particles can be pushed outwards due to an electrical field between the at least one nozzle and the surrounding terrain feature and spatial electric field formed by the negatively charged fine particles, the negatively charged droplets and the electrons,
• wherein the negatively charged droplets supplies the electrons to the target region in the open space when the negatively charged droplets are evaporated or fissioned,
• wherein fine particles in the target region in the open space are charged by the electrons,
• wherein the spatial electric field induced by the negatively charged fine particles, the negatively charged droplets and the electrons have a non-uniform charge density between the at least one nozzle and the surrounding terrain feature such that the non-uniform charge density provides a driving force for pushing the fine particles outwards.