Patent ID: 7658786

Claim:
A method for improving air quality in a limited space, comprising: a process of suctioning air from the limited space, comprising suctioning air from the limited space and transferring them outside the limited space as an air source for making oxygen; a process of making oxygen outside the limited space, comprising extracting oxygen from the air source transferred outside the limited space, and directly discharging waste gas generated therefrom outside the limited space; a process of supplying oxygen into the limited space, comprising transferring extracted oxygen into the limited space and supplying the oxygen via an oxygen-supply controller; and a process of supplementing air into the limited space, comprising supplying air into the limited space during the process of suctioning air from the limited space; wherein the oxygen is supplied to users in the limited space via a humidification pot and a straw during the process of supplying air into the limited space.