Indoor air pollution is a growing concern. The amount of time people spend indoors continues to grow, and according to a U.S. Environmental Protection Agency survey, people spend at least 90% of their time indoors.

Therefore, indoor air pollution has attracted full attention, the owners of buildings, equipment staff, industrial production health practitioners and some of their staff are increasingly concerned about indoor air pollution to ensure the comfort of the indoor environment and green health.

The sources of indoor pollutants are multifaceted, indoor sources are mainly two: one is generated by people's activities indoors, including breathing, smoking, cooking, the use of household appliances, etc. The second is the volatile and radioactive pollutants contained in construction materials, decoration materials and indoor furniture, in the process of their use can be released to varying degrees into the room, resulting in indoor environmental pollution.

The most harmful indoor air pollutants are volatile organic compounds, mainly formaldehyde and benzene, the source of pollution is mainly the various materials used in decoration, the above factors will release a certain concentration of toxic and harmful gases indoors, especially in closed rooms with air conditioning, indoor environmental quality deterioration.Therefore, it is necessary to install indoor air quality monitor in our life.