1, there are 6 standards for qualified masks certified by the state. They are: GB 19083-20 10 medical protective mask, YY 0469-201/kloc-0 medical surgical mask, YY/T0969-20 13 disposable medical mask and GB/T 30.

2. Before COVID-19 was completely eliminated, except for high-risk groups such as medical personnel, ordinary people actually wore disposable medical masks that met national standards for daily protection.