A certain amount of formaldehyde will remain in wood-based panels such as plywood, profile panels, medium density fiberboard and particleboard in indoor public places. In addition, wall covering, wallpaper, chemical fiber carpets, foam plastics, paints and coatings all release formaldehyde to the outside world for a long time, reaching 3- 15 years.

In the process of interior decoration, there are benzene besides formaldehyde. Benzene is produced in various adhesives, waterproof materials, coatings and paints. Excessive inhalation of benzene has a strong stimulating effect on skin and upper respiratory tract, and long-term inhalation can lead to hematological tumor diseases, aplastic anemia and fetal malformation.

Radon gas: exists in concrete additives, antifreeze, whitening agents, marble and granite;

TDI: Toluene Dicyanate, which is very toxic, is produced in plates, paints, coatings, sealing paste, insulating materials and so on.