What are the sources of pollution that affect indoor air quality?

There are five types of pollution sources that affect indoor air quality:

-Fuel combustion products such as carbon dioxide, carbon monoxide, nitrogen oxides, alkanes and aldehydes;

-Use of chemicals and other aerosols, such as insecticides, deodorants, mousses, hair sprays, etc .;

-Use of electronic products, such as household appliances, laser printers, copiers, etc .;

-The release of building materials and decorative materials, such as bricks and tiles, cement, asbestos products, plywood, particle board, plastic veneer, paint, carpet, etc. will release a large number of toxic and harmful gases;

-The products of human activities, such as breathing, skin secretions, indoor pet flowers and tobacco emissions and smoking.