Can prevent smog.
This level of masks is very good. It is a mask with filtering efficiency for particulate matter in our country. The medical protective masks we wear may come into contact with patients, and the patients may sneeze or cough, and there may be some splashes. , or when intubating a patient, there is still some splash. General particle masks cannot block this kind of splash.
This kind of mask has better filtration effect than normal masks, but it does not mean that ordinary masks cannot prevent. Ordinary masks also have certain defensive capabilities. If you are in close contact with patients, ordinary masks Masks will be very risky. You can decide what type of mask you need based on your situation.