Nowadays, the environment we live in is getting worse and worse. There are often smog weather in many areas. However, PM2.5 protective masks and anti-fog masks are becoming more and more popular. However, many people protect against disposable protective masks. The effect is very little, and the small piece of disposable mask below will be introduced to the user.
Good filtering effect does not mean good protection effect.
Filtration efficiency only refers to the filtering effect of the filter cloth material in the core part of the dust mask, and does not represent the protective effect of the mask, because the mask also has the problem of sealing. Even if the filtering effect of the filter cloth can really reach 99%, if the sealing is not good, the protective ability of the mask will be greatly reduced. The new standard for mask performance uses a comprehensive indicator of "protective effect" to define the performance of the mask with the intuitive effect of "quality of air drawn into the body after wearing a mask". This can avoid the current masks only pay attention to the filtration effect and ignore the lack of sealing. After the mask is worn, the inhaled PM2.5 concentration can be reduced to 75 micrograms per cubic meter or less, so that the air quality inhaled into the body after filtration is good and above, which is qualified.
Different pollution indexes require different levels of masks
The air inhaled after wearing the mask should at least reach the “good” level in the air quality standard, but the air outside the mask varies widely, which puts different requirements on the performance of the mask. Therefore, the standard divides the protection level of the anti-smashing mask into four levels from low to high: D, C, B, and A, corresponding to the air quality category setting and air pollution in the national air quality standards - D The grade is suitable for moderate (PM2.5 concentration ≤150 micrograms per cubic meter) and below pollution, grade C is suitable for heavy (PM2.5 concentration ≤250 micrograms per cubic meter) and below pollution, grade B is adapted to severe pollution (PM2 .5 concentration ≤350 micrograms per cubic meter), class A is used at a concentration of 500 micrograms per cubic meter of PM2.5. Before going out, you can first look at the air pollution situation, and then choose the protective mask to wear according to the actual situation.
Not everyone can wear a protective mask
People with frailty such as the elderly, children, and patients with cardiopulmonary disease need to be cautious when using the N95 mask. If necessary, follow the doctor's advice. If you are unsure about the suitability of your physical condition or the trade-offs of wearing a mask, you should consult your doctor.
In addition to some high-end models for harsh environments, dust masks generally do not have an oxygen supply, but instead increase respiratory resistance to varying degrees. The power of breathing comes from the movement of the respiratory muscles such as the diaphragm, which means that the wearer needs more force to drive the respiratory muscles to achieve gas exchange. For the weak and weak respiratory muscles or the weak and weak heart and lung function, this extra The consumption may be quite large, and the damage caused by respiratory muscle fatigue, ventilation, and hypoxia may exceed the risk of the particulate matter itself, so these people need to be cautious in wearing masks.