1, whether it is a disposable mask, or medical masks, in fact, there are positive and negative, take disposable masks, the dark color is the front, the front should face out, and medical masks on the nose clip metal strip. 2, facing the face should be the reverse side of the medical mask, that is, the lighter side of the color, in addition, pay attention to the part with the metal bar should be in the upper part of the mask, do not wear the opposite. 3, clearly distinguish between the front of the mask, the reverse side, the upper end, the lower end, wash your hands first, to determine whether the mask is correct, then hang the two ends of the rope on the ears. 4, the last step, but also mentioned the metal bar problem, the mask will be worn, you need to use both hands to press the metal bar on both sides of the bridge of the nose, so that the upper end of the mask tightly against the bridge of the nose, and then stretch the mask downward, so that the mask does not leave wrinkles, and it is best to cover the nose and mouth. Tips: Smell the way there are successive, the art of specialization, masks are also divided into different categories. Currently, there are cotton masks, paper masks, activated charcoal masks, sponge masks, medical surgical masks and N95 masks and other categories on the market. However, only medical surgical masks and N95 masks can play the function of preventing infectious diseases. Medical surgical masks are generally used in medical clinics, laboratories, operating rooms and other high-demand environments for health care workers to wear when working. The safety factor is relatively high, and the resistance to bacteria and viruses is strong. Medical surgical masks can also be used to prevent influenza. Medical surgical masks” for (YY0469-2011), “single-use medical masks” for (YY/T0969-2013). And YZB refers to the medical device enterprise registration standard, that is, the product standard developed by the enterprise itself, which can be queried in the State Drug Administration. N95 type mask is is one of the 9 types of anti-particulate matter masks certified by NIOSH (National Institute for Occupational Safety and Health). “N” means not suitable for oily particles (frying fumes produced is oily particulate matter, while people talking or coughing droplets produced is not oily); “95” means that, under the testing conditions specified in the NIOSH standard, the filtration efficiency of 95%. N95 is not a specific product name. As long as the product meets the N95 standard and passes the NIOSH review, it can be called “N95 mask”. The most important feature of N95 masks is that they can prevent droplet infections caused by the splashing of body fluids or blood from patients. The size of the droplets ranges from 1 to 5 microns in diameter. The U.S. Occupational Safety and Health Administration (OSHA) for healthcare organizations stipulates that medical personnel exposed to tuberculosis bacteria must wear masks of N95 standard or higher. Take coronavirus as an example (2019-nCoV is a kind of coronavirus), the average diameter of about 100nm that is 0.1.um, plus transmission carriers, such as droplet diameter of about 1-5um, and N95 on 0.3um non-oil particles filtering effect ≥ 95%, N95 can achieve effective filtration. It is worth noting that when choosing N95 masks, try to choose N95 masks without breathing valve. Some analysis results show that there is no significant difference between N95 protective masks and medical surgical masks used to prevent infectious acute respiratory infections in the clinical environment. However, it is also said that N95 masks are better airtight. How to wear masks for special people? 1, pregnant women wearing protective masks, should pay attention to the combination of their own conditions, choose a better comfort products. Before wearing should consult with a professional physician to confirm that their physical condition is suitable. 2, the elderly and chronically ill patients with different physical conditions, such as cardiopulmonary disease patients wear will cause discomfort, and even aggravate the original condition, these people should seek professional guidance from a doctor. 3, children in the growth and development stage, its face is small, it is recommended to choose the regular manufacturers of children’s protective masks.