The indoor environment generally refers to a closed or semi-enclosed environment such as a home, an office, a factory, a theater, a restaurant, or a shopping mall. Due to the presence of air pollution sources that are continuously or intermittently discharged indoors or outdoors, contaminants accumulate in confined spaces under poor ventilation conditions, causing harm to the human body.

About 90% of the time per person per day is in the indoor environment. The quality of indoor air quality directly affects the quality of life and work efficiency. Therefore, indoor air pollutants are gradually receiving people's attention. It is imperative to effectively monitor indoor air quality, conduct hazard risk assessment, and actively take relevant measures.

A large number of foreign studies have shown that indoor air pollution can cause "pathogenic building syndrome" (BBS), symptoms include headache, eye, nose and throat discomfort, dry cough, dry and itchy skin, dizziness, disgusting attention, difficulty in concentration and odor Sensitive and so on. Building related diseases (BRI), symptoms include cough, tight chest, fever, chills and muscle pain.

In recent years, pollution pollution that is harmful to health has caused an increase in global population morbidity and mortality. The reason is that the building materials selected in the newly built and rebuilt buildings contain harmful substances and are seriously exceeded. The quality of the construction is poor, which will cause air pollution in the indoor environment. Air toxic pollution occurs in people's daily work and living environment, which can cause pharyngitis, chest tightness, dizziness, decreased vision, and skin blistering. Heavy will affect the body's immune system, cause blood diseases and other serious diseases, and even cause cancer.

Therefore, it is necessary to carry out indoor environmental testing. Through scientific testing methods, everyone can always understand the quality of their environment and take measures to improve air quality.

With the development of the economy and the improvement of the taste of life, more and more people are beginning to pay attention to health and environmental protection. After the renovation of the new home, in addition to the basic ventilation and the placement of formaldehyde-removing plants and charcoal packages, many people will also use air quality detectors to comprehensively test the air quality and comprehensively protect the health of pregnant women, children, the elderly and family members. .

Generally speaking, the environmental parameters mainly measured by the indoor environmental monitor or the online monitoring system generally include CO2, temperature, humidity, PM2.5 particulate matter, noise, formaldehyde, air pressure and the like.