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nature : people's lifetime is about 70% spent in the room. Studies show the number of indoor living supplies are also sources of pollution, they would release of poisonous pollutants. Even the body itself produce directly polluting substances, such as known as the carbon dioxide, ammonia, odors, ofDe bacteria. The main indoor air pollutants such as combustion appliances also emit carbon monoxide, nitrogen oxides, sulfur dioxide, and other hydrocarbon compounds. Building materials, distributed by the office facilities of formaldehyde, radon, asbestos fibers, upholstery, paint furniture, plastic products may discharge of organic solvents, the use of pesticides, fungicides used, hair spray propellant to bring out the various machines pollutants resulting from human activities which emit smoke cigarettes. the tar, nicotine and others. Many pathogenic microorganisms in the air, especially in the indoor temperature higher, more dust, bad ventilation, lack of sunlight, longer survival time, its pathogenicity will remain longer. In consideration of contaminated material changes occur over time or location in space on the uneven distribution will add to the seriousness of the problem, which is receiving increased attention to the issue of indoor pollution.
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