With the great improvement of human material life and the progress of society, human demand for the environment is getting higher and higher, especially the indoor environment which is most closely related to people's daily life. The pollution of indoor environment not only affects the comfort of living, but also seriously affects the work efficiency and life health.

For most people, chemical pollution and radioactive pollution caused by building decoration and furniture are the main causes of indoor environmental pollution. But in fact, the most harmful indoor pollution to human beings is biological pollution. According to statistics, acute respiratory infections caused by air pollution kill about 4 million children every year, and 1.4 billion people are threatened by unsafe air every year. It can be said that biological pollution is the biggest threat to people's health caused by indoor environmental pollution.

According to the Canadian Health Organization survey, 68% of human disease types are related to indoor air pollution, especially air microorganisms. In China's "Air Quality Standards", indoor air pollution, chemical pollution and radioactive pollution are listed as the three major indoor air pollution control indicators, which proves the seriousness of biological pollution to human health.

Biological pollution in indoor air mainly includes bacteria, fungi, pollen, viruses, biological organisms and so on. These biological pollution can cause various respiratory infectious diseases, asthma, allergy, building syndrome and so on. According to the data released by the World Health Organization, there are more than 200 kinds of viruses known to cause respiratory infections, 83% of which can be transmitted through indoor air. In 80 high-income countries and 53 upper-middle-income countries, respiratory diseases caused by indoor biological pollution account for 13% of deaths each year. It can be said that indoor biological pollution is one of the major factors causing disease and death.

The consensus of today's society is to achieve the goal of solving the problem of indoor environmental pollution through air purifiers, but in fact, most air purifier brands focus on solving chemical pollution, radioactive pollution and dust pollution, but little on biological pollution. In general, the use of ozone and ultraviolet disinfection technology of air purifier is the current solution to biological pollution of the mainstream air purifier, while the more advanced Aijisen air purifier is the use of ATP-HEPA antibacterial peptide filter technology, sterilization and disinfection more comprehensive.