Why can't plain oxygen generators be used at high altitudes? It's because the molecular sieves are different

In plain areas, the air humidity is relatively stable, and using ordinary molecular sieves can normally separate over 90% of the oxygen. However, in many areas of the plateau, the humidity fluctuates greatly (such as being humid during the rainy season and dry during the dry season), and due to the low air pressure, the oxygen production efficiency will decrease. The oxygen concentration may drop below 80%, failing to meet the medical standards. It is also prone to breakage due to moisture, and may need to be replaced within less than one year. The molecular sieves of the plateau oxygen generators have undergone anti-humidity treatment, with a hydrophobic layer on the surface. Even with large humidity fluctuations, they can still stably separate over 90% of high-purity oxygen, and are less prone to powdering problems, fully meeting the long-term oxygen supply scenarios such as for plateau families, hotels, diffusion oxygen supply in plateau clinics, etc.