Disposable mask

It can prevent respiratory infection to some extent, but it can't prevent smog.

Medical surgical mask has three layers, namely waterproof layer, filter layer and comfort layer from outside to inside. The comfort layer is a non-woven fabric. When wearing, the white non-woven fabric faces inward, the blue waterproof layer faces outward, and the side with metal sheet faces upward. Don't wear it backwards. After the rubber band is hung on the ear, pinch the metal piece and nose to make the cheeks smooth and there is no gap between the mask and the face as far as possible.

Pay attention to when buying, and choose a mask clearly marked with the words "medical surgical mask" on the outer packaging.

N95 Respirator

It can effectively prevent respiratory tract infection and smog.

N95 mask is one of nine kinds of anti-particle masks certified by NIOSH. "n" means not suitable for oily particles; "95" means that the filtration efficiency reaches 95% under the detection conditions specified by NIOSH standard.

N95 is not a specific product name. As long as the product meets the N95 standard and passes NIOSH review, it can be called "N95 mask".

The biggest feature of N95 mask is that it can prevent droplet infection caused by splashing body fluids or blood of patients. The diameter of the droplet is 1 to 5 microns.

The Occupational Safety and Health Administration of the United States stipulates for medical institutions that medical personnel exposed to tuberculosis must wear masks above N95 standard.

Compared with medical surgical masks, N95 masks have better sealing performance. When choosing N95 mask, try to choose N95 mask without breathing valve.

Ordinary cotton mask

Its materials may be cotton, gauze, wool, canvas and velvet. Because this material itself is not dense enough to prevent infection.

For the purpose of self-protection and reducing the risk of respiratory infection, you can wear medical surgical mask and N95 mask.

If you go to a general open-air public place without contact with patients, you can choose to wear a medical surgical mask without excessive protection. However, if you come into contact with patients with suspected respiratory infection, you should wear N95 mask.

Wear a mask when going to the hospital or visiting patients, especially when going to the hospital fever clinic or respiratory department;

In the season of high incidence of respiratory infectious diseases, it is recommended to wear masks in crowded places such as supermarkets, shopping malls and cinemas.

In order to prevent the disease from spreading to others, you should wear a mask in time when you have symptoms of respiratory diseases such as fever, cough and runny nose.

In addition, it is recommended to wear a mask when outdoors in foggy days.