Formaldehyde, also known as formalin, is a toxic substance, which is very harmful to human body. Formaldehyde comes from materials used in interior decoration or furniture, such as plywood, blockboard, medium density fiberboard, particleboard, paint, coating and adhesive. These chemicals, which contain formaldehyde to varying degrees or can be hydrolyzed into formaldehyde, will definitely exceed the standard after decoration. The most popular method in in addition to formaldehyde is ventilation, or putting tea residue, grapefruit peel, onion slices, pineapple pieces or fumigating the whole room with white vinegar in the newly renovated room, but the effect is not good. Raising some plants still has some functions. You can raise some flowers such as chlorophytum, aloe, cactus, and tiger tail orchid. Absorb indoor polluted gas. You can brush some photocatalyst wood essential oil on the wooden furniture or floor at home to effectively decompose formaldehyde. If you are not at ease, you can use some materials from in addition to formaldehyde, such as activated carbon, and the effect is good.