This standard specifies the classification and specifications, technical requirements, testing methods, inspection rules, packaging, labeling, storage and transportation of children's masks (hereinafter referred to as masks). This standard applies to masks worn by children in ordinary environments to filter out particulate pollutants and block pathogenic microorganisms, pollen, droplets, secretions, etc. This standard does not apply to special masks for hypoxic environments, protection against harmful gases and vapors, escape and firefighting, etc.; it does not apply to masks for infants and young children aged 36 months and below.