Then, there are national standards for medical surgical masks. Look for the standard number: YY0469-2011, which is usually on the mask packaging, and some are in the upper right corner.
How do I know if I bought a surgical mask?
A medical mask should have 3 layers. You can judge from the appearance, standard number, and the qualification of the manufacturer. First of all, the words "medical surgical mask" must be written on the outside of the package. Many Taobao stores claim to be medical surgical masks, but on the packaging Dare not write.