Recently, the temperature has dropped and the weather has been cold, which has led to a prolonged period of time for the virus to survive. At present, the epidemic situation in some foreign countries has experienced a wave of reversal, and the re-emergence of the epidemic has already produced a new coronavirus variant, which is more infectious. Under such strict prevention and control in China, several local cases have appeared one after another. At this time, we should pay more attention to protection and wearing masks, so as not to allow loopholes in our epidemic prevention projects.
We must remember to wear masks when we go out, which is responsible for our own life and property, and also for the life and property of others. There are two main factors for judging the respiratory protection effect of masks on pathogenic microorganisms in the air: one is its filtration efficiency for particulate matter, and the other is the degree of closeness between the mask and the face of the wearer of the mask.
