PAHs (Polycyclic Aromatic Hydrocarbons) are a class of organic compounds with carcinogenic, mutagenic, and teratogenic risks, mainly originating from the petroleum processing industry, coal combustion, wood combustion, and garbage incineration and other incomplete combustion processes. Due to the carcinogenicity of many of its compounds, there are strict limit standards in various products, especially for children's toys, food contact materials, and plastic products.

Particularly for children's toys, food contact materials, and plastic products, the restriction of PAHs is especially important. There are strict control regulations for such substances in regions like the European Union and Germany, and products exported to these regions must pass relevant tests.