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Quartz lamp placed in to the metro train. Everytime train ends in depo, laps are eject. It takes only few minutes of intensive quartz lamp to remove flu bacterias. Problem is that metro train doesnt have ingress to sun light, that naturaly reduce count of micro organismus. Normaly man touches handrail in one place during one train ride, when metro goes through frequented stations, than metro depopulate- this quartz lamps will be radical thing which decrease illnses and flu epidemics in the city