1. Wallpaper The vinyl chloride wallpaper contains phthalate ester, a chemical softener. It is one of the dangerous substances that are feared to be toxic, and it slowly volatilizes for a long time and pollutes the indoor air. If a young child is constantly exposed to such an environment, he or she may develop genital disorders, so be careful. ◇ Countermeasures: It is recommended to use natural ..