It is reported that indoor air pollutants can be divided into three categories: inhalable particulate matter, bioactive particle pollutants, and gaseous chemical pollutants. Inhalable particles, also known as "drifting dust", can remain suspended in the air for a long time and are easily inhaled by the human respiratory system. Besides carrying bacteria, viruses, and other bioactive pollutants, they are also the main carriers of various carcinogenic chemical pollutants and radioactive substances; Bioactive particles include bacteria, viruses, pollen, etc., where bacteria and viruses in the air are the main culprits behind most respiratory infectious diseases and allergic conditions; Gaseous chemical pollutants in the air include various volatile organic compounds and inorganic substances, such as common volatile organic compounds like toluene, formaldehyde, benzene, and multiple hydrocarbons, esters, ketones, etc.
Experts warn that sterilization and disinfection cannot guarantee continuous cleanliness of indoor air quality. The key to improving indoor air quality lies in the scientific use of air conditioners. Air conditioners used in summer should have their filtration systems cleaned before being used again in winter. Even when using central air conditioning, additional filtration devices should be added to remove various pollutants from the air as it enters the air conditioning system, indoors, or during circulation. Only then will there be a noticeable improvement in indoor air quality.
Note: The latter part of the original text seems to list unrelated items and services which were not translated as they do not pertain to the context of indoor air pollution. If you need those translated as well, please let me know!