The protective effect of the mask should be evaluated from five aspects: human head and face fit, respiratory resistance, particulate matter filtration efficiency, population adaptability and health safety. At present, ordinary masks and disposable non-woven masks on the market may have a certain blocking effect on dust and large particles, but the protection for haze, PM2.5, bacteria, viruses and other microbial particles is not enough
knowledge in choosing anti haze masks
in order to further understand the effect of wearing anti particulate masks, scholars from China Center for Disease Control and prevention once conducted a simple small experiment. The results show that the concentration of PM2.5 is about 350 μ 1n the case of kn95 mask, the decrease rate of PM2.5 was more than 84%; After wearing Kn90 mask, the decrease rate of PM2.5 was 81.5%; Wearing ordinary disposable non-woven mask has no effect on reducing PM2.5. The results suggest that it is effective to wear anti particulate mask in haze days. After covering the sampling port with mask, the PM2.5 reduction rate of kn95 mask was more than 91%, and that of ordinary disposable non-woven mask was 45.5%
it can be seen that the ordinary disposable non-woven mask has a certain ability to filter particles, but it can’t fit the face tightly when wearing, so it can’t play the role of anti particles when wearing. Wearing anti particulate mask can reduce the concentration of PM2.5 and the exposure of people to particulate matter, which is beneficial to health protection
combined with “respiratory protective equipment, self-priming filter type anti particulate matter respirator” (gb2626-2006), “selection, use and maintenance of respiratory protective equipment” (GBT 18664-2002) and “technical requirements for medical protective masks” (GB 19083-2010), it is recommended to choose masks marked kn95 or N95 (minimum filtration efficiency of 95% for non oily particles) and FFP2 (minimum filtration efficiency of 94%). 1n addition, when choosing masks, the user’s face shape and comfort should also be considered
it’s also important to wear masks.
wash hands before and after wearing masks. The colored side of the mask is outward, and the metal side is upward. Press the metal pieces on the mask along both sides of the bridge of the nose to make the mask close to the face. Avoid touching the mask after wearing it. 1f you have to touch the mask, wash your hands thoroughly before and after touching. Air tightness inspection must be carried out after wearing the mask every time. Cover the mask with both hands and exhale. 1f you feel that there is gas leaking from the nose clip, you should readjust the nose clip; 1f you feel the gas leaking from both sides of the mask, you need to further adjust the position of the headband and ear band. 1f the fit cannot be obtained, the mask model needs to be changed
special people should be cautious when wearing masks
wearing masks will increase respiratory resistance and stuffy heat, not everyone is suitable for wearing masks. Special people should be careful when choosing protective masks
when pregnant women wear protective masks, they should pay attention to the combination of their own conditions and choose products with good comfort, such as protective masks with expiratory valves, so as to reduce expiratory resistance and stuffy feeling. Before wearing, consult a professional doctor to confirm that your physical condition is suitable. The elderly and patients with chronic diseases have different physical conditions. For example, patients with cardiopulmonary diseases will feel uncomfortable after wearing it, and even aggravate the original condition. These people should consult their doctors and seek their professional guidance. Children are in the stage of growth and development, and their face shape is small, so it is difficult for general masks to achieve the effect of close fitting. 1t is recommended to choose the protective masks suitable for children produced by regular manufacturers