There are many reasons for indoor air pollution, such as office air pollution, kitchen air pollution, bedroom air pollution and so on. Air pollution in offices or public places and its harm to the human body: Instruments and equipment such as copiers and electrostatic precipitators used in offices produce ozone (O3). O3 is a strong oxidizing agent.

Centralized office areas with more office equipment such as computers in the office will be vacuumed due to static electricity generated by electrical appliances, and dust will be released into the air after power failure. Offices with poor ventilation, such as finance rooms, computer rooms, storage rooms, etc., have poor air circulation, and the accumulation of toxic substances in the air will stimulate the respiratory system. That's why the smoke purifiers are used.

In densely populated offices or supermarkets, dust particles, sneezing droplets, etc., can cause air quality to decline, especially if sneezing droplets can stay indoors for about an hour and require frequent ventilation. The causes of household air pollution and its harm to the human body: the fumes produced by kitchen cooking will scatter to other rooms, adsorb on walls, clothes and furniture, and more importantly, contain carcinogenic mutants.

Smoke from coal burning for winter heating contains high levels of carcinogenic PAHs. The living room is not clean, the environment is wet and hot, etc., will cause the breeding of allergenic organisms. The main indoor allergens are fungi and dust mites. The use of cosmetics, pesticides, flavors and other secondary air pollution in the family room. Ventilation should be frequent when the outdoor air is good. Air pollution caused by smoking, pet hair and pollen dispersal has become a common understanding of the harm to human health, and will not be repeated here.