How to choose?
Usually-medical surgical masks
Medical surgical masks are divided into 3 layers, the outer layer has a water blocking effect to prevent droplets from entering the mask, the middle layer has a filtering effect, and the inner layer near the mouth and nose is used to absorb moisture.
Go to the hospital-N95 mask
N95 masks are disposable medical protective masks, which have the best protective effect. If you are in contact with patients, for example, you can wear an N95 mask when you go to the hospital.