Prevention of new coronavirus pneumonia does not have to wear 3m masks, the general population can use medical surgical masks, the protection of crowded places should use particulate protection masks, mask filtration efficiency should reach KN90/95/100, N90/95/100 standards.
Particulate matter protective masks are better than single-use medical masks and medical surgical masks. Medical personnel engaged in patient care, incident scene investigation, sampling and testing of disease control personnel, as well as hospital isolation area cleaning, security and other service personnel, should take stricter protective measures when engaged in the prevention and control of the epidemic.