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Red light, green light: new Japanese CO2 sensor warns of room crowding

The "CO2 Sensing Pole," which indicates the concentration of CO2 with three color lights, is seen in Osaka's Kita Ward. (Mainichi/Tatsuya Fujii)

OSAKA -- A new carbon dioxide sensor that visualizes how crowded a room is has been gathering attention in Japan as a measure to prevent novel coronavirus infections.

    The sensor, named "CO2 Sensing Pole," measures the concentration of CO2 in the room and indicates it with color signals.

    The sensor was developed by honorary professor Mitsunori Miki at Doshisha University based in the western Japan prefecture of Kyoto, Sakai Spirit Machine Industry Place Co. based in the city of Sakai, Osaka Prefecture, and Ace Point Systems, Inc. based in the city of Osaka.

    The device is 110 centimeters tall, and has red, yellow and green indicator lights at the top. By visualizing CO2 concentrations, it lets people efficiently ventilate the room, and is effective in preventing the spread of infections under environments where micro airborne droplets easily scatter, such as restaurants, hospital waiting rooms and care facilities.

    Miki said, "It's highly visible from anywhere, and helps users realize the concentration of carbon dioxide to sufficiently ventilate a room."

    (Japanese original by Tatsuya Fujii, Osaka Photo Department)

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