How to monitor indoor air pollution

 According to surveys, urban people spend more than 80% indoors every day, and indoor air quality has an important impact on human health. Indoor air quality is mainly affected by three aspects, including outdoor air quality, indoor home improvement and occupants.

Many people have the habit of opening windows for ventilation every day. Opening windows in time of poor air quality can easily lead to a decrease in indoor air quality. Indoor home decoration is the biggest source of indoor air pollution. Furniture, floors, and various decoration materials will continue to release formaldehyde, TVOC and other pollutants into the room. The release period of formaldehyde can be up to 15 years. Residents are another major source of indoor air pollution. People, cats and dogs and other animals live indoors for a long time, and they are always volatilizing organic matter into the air. When encountering headaches, brain fever, physical discomfort, etc., they will also give birth to a large number of bacteria and viruses. The environment will allow bacteria and viruses to multiply in large quantities, and peculiar smells will appear over time.

Long-term living in indoors with formaldehyde, TVOC, bacteria, viruses, and peculiar smells, residents are prone to various physical diseases. For example, formaldehyde can cause abnormal immune function, liver damage, and damage the eyes, nose, throat, upper respiratory tract and skin system. Too high TVOC concentration can cause dizziness, headache, chest tightness and other symptoms in the human body. The abundance of bacteria and viruses is the "primal culprit" that causes people to contract influenza and other infectious diseases.

Facing the threat of indoor air pollution, many people use AQI sensors to monitor indoor harmful substances and provide outdoor data for indoor air monitoring systems. For indoor air monitoring systems, there will be convection between indoor and outdoor air because it involves problems such as pipe ventilation and opening windows in the building. But it does not mean that the outdoor air is necessarily better than the indoor air. For example, in severe smog, opening windows for ventilation is not a good practice.