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This is a new material made wallpaper which can detect the density of CO2 in interior. When the density exceeds normal, the color of wallpaper will changes to remind people going outside or opening the windows.
It could be widely used in crowded places like school, cinema and bus. Or some special space which need fresh air particularly like bedroom and sickroom. That can help people to judge the quality of interior air and make the right action .
China Academy of Art