What pollutants are there in the air?

People can skip meals for 7 days and drink water for 2 days, but they can't live without air for a moment. Adults have to breathe in 15kg of air, eat 1.5kg of food, and drink 2kg of water every day. 

According to surveys, most people spend more than 90% of their time indoors, especially urbanites. Therefore, it has become a basic requirement for people to breathe fresh and healthy air indoors. Indoor air pollutants generally include polluted gases and suspended solids, such as PM2.5, bacteria, viruses, pollen, peculiar smells, and harmful gases. In addition to the outdoor sources of indoor air pollution, indoor smoking, harmful gases released by home furnishings, kitchen fumes, and human activities are also important sources of indoor air pollution. In general, indoor air pollutants have a wide range of sources and types, which can cause harm to human health in many aspects. 

A study by the US Environmental Protection Agency has shown that indoor air pollution is 2-5 times more serious than outdoor air, and can reach 100 times in special circumstances. Environmental research data shows that there may be more than 400 chemical substances and 900 different organic compounds in the indoor environment of the home, and pollution comes from all aspects of life, including smoking, cooking, dust mites, pet dander, household cleaning products and furniture emissions. Harmful gases and PM2.5 pollution infiltrated from outdoors.

 In indoor environments, especially in poorly ventilated and crowded environments, some pathogenic microorganisms are easily spread through the air, causing susceptible people to infect some common diseases caused by viruses and bacteria, such as influenza, measles, tuberculosis and other respiratory infections. Diseases, they will all spread indoors with the help of the air.