Indoor air pollution and health" released by the world health organization points out that at present, the level of indoor air pollution is 5-10 times higher than outdoor pollution, 4% of global diseases are related to indoor air quality, and about 2 million people die prematurely due to diseases caused by indoor air pollution every year.Nearly half of the world's people are exposed to indoor air pollution, which has become one of the top 10 threats to human health.Indoor air pollution is mainly divided into three categories: 1) inhalable particulate matter (PM10 and PM2.5), mainly introduced by outdoor haze. 2) microbial pollutants.Such as allergic reactants, viruses, fungi and microorganisms that thrive in damp places. 3) gas pollutants.Volatile organic compounds (VOCs) are the main components, such as formaldehyde and benzene, which are mainly caused by building materials.

Air is an important transmission route of bacteria, viruses and other microorganisms. In our work and living places, we are always exposed to the hazards of viruses and harmful bacteria in the air. Clean and fresh air is the foundation of life. Air sterilization is not just put a potted plant, indoor environment by suspended particles contaminated pathogens such as bacteria, viruses. Inhalable particles such as dust, smoke, pollen. 

The acceleration of urbanization process has affected the air quality, especially the roadside, the house beside the construction site. PM10 and PM2.5 appear in the form of dust from the windows into the indoor. Closed air pollution is becoming invisible killer, harm to human health. The airless environment breed bacteria, and outdoor air is unclean. Ventilation air purifier system can provide fresh air to the indoor 24 hours continuously. The dirty air in the room is discharged from the room through the air outlet, exhaust pipe and fan. 

Most of the severe symptoms are respiratory diseases, mostly cumulative;In the high concentration of toxic odor gas under the action may cause acute severe, even death.People living in a fetid environment for a long time will subconsciously suppress their breathing for a long time, even holding their breath, hindering their normal respiratory function.Changes in pulse and blood pressure occur with respiration.If ammonia can make the phenomenon that blood pressure appears to drop first after rising;People often come into contact with the stench will make people produce anorexia, nausea and even vomiting, and then develop digestive function decline;Be stimulated by Odor stimulation frequently can make the endocrine system function disorder. Life and work attention is not concentrated, judgement, attention drops, affect the thinking activity of the brain. What's more, these peculiar smell is to take a certain number of harmful substances to human body.