Protective coronavirus, the first choice of masks, now the officially recommended masks are medical surgical masks and N95 masks. Now talk about the common sense about these two types of masks.

Medical surgical masks are divided into three layers. The outer layer can obstruct dust and water vapor, and avoid droplets from entering the mask. The middle layer has a filter effect, can obstruct more than 90% of the 5 micron particles, the innermost layer is used to absorb moisture, basically surgical masks meet the isolation of mouth and nose secretions.

Surgical masks are generally used for 4-6 hours, and should be discarded after exceeding the time. No recycling; suggest that medical masks are divided into nursing masks and surgical masks. In appearance, four surgical masks are fixed behind the neck and behind the pillow, while the nursing mask is ear hanging. The officially recommended protection is a medical surgical mask.

N95 masks are not a brand, and N represents the protection standards set in the United States. N indicates that "Non-oil" (is non-oily particulate matter), and generally non-oily particles refer to coal dust, cement dust, acid fog, microorganisms, etc.

Therefore, the N95 mask is tested with 0.3 micron sodium chloride particles, the isolation efficiency is above 95%, and the face tightness test of the user to ensure that the air can pass through the mask at the edge of the face.

For other masks such as activated carbon that are not close to the face, such as hospital fever clinic, try to wear masks before entering the indoor, because the concentration of viruses in the wild is far less than the indoor.

Second, remember not to use the mask by hand. Because the N95 mask can only isolate the virus on the surface. If you squeeze the mask with your hand, the virus will wet the mask with the droplets, causing a chance of infection.

 The diameter of coronavirus is generally about 0.1 microns, while the gap between N95 and medical surgical masks is 0.3 micron, so some people say that wearing a mask cannot prevent the virus. It needs to show that coronavirus is generally conveyed by droplets, and the intention of wearing a mask is to avoid droplets entering the mouth and nose.

Can not wear a mask: outdoors, the air flow is good, and at 30cm intervals apart from people, you can consider going away from wearing a mask.

In daily areas, conditionally adopt natural ventilation methods as far as possible. If the blowing fan will be adjusted to the minimum, the best skin can not feel the wind.

In addition, in addition to droplets transmission, the virus can also be conveyed through contact, so hand hygiene is very important, in addition to pay attention to hand washing and disinfection, but also remind themselves and others not to contact the eyes and mouth and nose.