There are two sources of pollution in clothing: first, pesticides, fertilizers and herbicides are used to control pests and diseases during the cultivation of clothing raw materials. If these toxic and harmful substances remain on clothes, it will cause skin allergies, respiratory diseases or other toxic reactions. Second, in the process of processing and manufacturing, many harmful chemicals, such as oxidants, catalysts, flame retardants and whitening fluorescent agents, remain on textiles, which will cause secondary pollution to clothing.

The shaping step in the later stage of clothing will also use chemicals containing formaldehyde, which will also cause pollution to clothing.

Formaldehyde content is an index that has great influence on human health. In the production of garment fabrics, formaldehyde is always added to the auxiliaries in order to achieve the functions of wrinkle resistance, shrink resistance and flame retardancy, or to maintain the durability of printing and dyeing, or to improve the hand feel. The residual formaldehyde will be gradually released in the process of wearing without washing and making clothes, and will combine with human sweat or hydrolyze to produce free formaldehyde, which will cause strong irritation to respiratory mucosa, eyes and skin, causing dizziness, respiratory inflammation and skin inflammation, which will seriously lead to blood system diseases and even cancer.

Because children's resistance is weak, formaldehyde is more harmful to the body.