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Indoor air pollutants generally include pollutant and suspended solids, such as bacteria, viruses, dust, pollen, mold spores, and stench, have poison XuePin and toxic gases. Indoor air pollutants generally include pollutant and suspended solids, such as bacteria, viruses, dust, pollen, mold spores, and stench, have poison XuePin and toxic gases. Indoor air pollutants generally include pollutant and suspended solids, such as bacteria, viruses, dust, pollen, mold spores, and stench, have poison XuePin and toxic gases

In daily life, bad indoor air can cause physical discomfort and poor health, while in the working environment, it can lead to high absenteeism and low productivity.

Founded in 2001, the European commission announced the beginning of may, "CAFE - European clean air" plan, and put it into the European plan, the plan aims to establish an integration strategy between eu countries, prevention and control of air pollution. The new eu legislation in 2004 will push the plan to its highest point.