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The complex chemistry of wool fiber enables it to bind pollutant gasses including formaldehyde, sulfur dioxide, nitrogen dioxide, and others chemically into its structure. It has been estimated that in this manner, WOOL CARPETS CAN CONTINUE PURIFYING INDOOR AIR FOR UP TO 30 YEARS. Researchers, using a controlled environment chamber, have demonstrated that wool carpet can reduce high levels of introduced formaldehyde to virtually zero within four hours. Studies by the US Gas Research Institute, which compared 35 building and furnishing materials, also showed that wool carpets have one of the highest removal rates of nitrogen dioxide of any of these materials. The UK Atomic Energy Research Establishment has shown that large amounts of sulfur dioxide are also irreversibly absorbed by wool carpets. Wool is a highly complex fiber that has been created by nature over thousands of years. It is simply not possible to get the benefits of wool from any man-made fiber.