Protective Effect Of Disposable Masks
The protective effect of disposable masks 1. Good filtering effect does not mean good protective effect
The filtration efficiency only refers to the core part of the dust mask-the filtration effect of the filter cloth material, and does not represent the protective effect of the mask, because the mask also has the problem of airtightness. Even if the filtering effect of the filter cloth can really reach 99%, if the airtightness is not good, the protective ability of the mask will be greatly reduced. The new standard uses comprehensive indicators such as "protective effect" for the performance of masks, and defines the performance of masks with the intuitive effect of "the quality of air inhaled into the body after wearing a mask". This can avoid that the current masks only pay attention to the filtering effect and ignore the lack of sealing. After wearing the mask, the concentration of PM2.5 inhaled can be reduced to less than 75 micrograms per cubic meter, so that the air quality inhaled into the body after filtration can reach a level of good or above, which is qualified.
The protective effect of disposable masks 2. Different pollution indexes require different levels of masks
The air inhaled after wearing a mask should at least reach the "good" level in the air quality standard, but the air outside the mask is very different, which places different requirements on the performance of the mask. Therefore, the standard divides the protection level of anti-haze masks 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 standard-D Class C is suitable for moderate pollution (PM2.5 concentration ≤ 150 micrograms per cubic meter) and below, Class C is suitable for severe pollution (PM2.5 concentration ≤ 250 micrograms per cubic meter) and below, and Class B is suitable for severe pollution (PM2 .5 Concentration ≤ 350 micrograms per cubic meter), Class A is used when the PM2.5 concentration reaches 500 micrograms per cubic meter. In the future, you can check the air pollution situation before going out, and then choose the protective mask to wear according to the actual situation.
The protective effect of disposable masks 3. Not everyone can wear protective masks
The elderly, children, patients with heart and lung diseases and other frail people need to be cautious when using N95 masks and follow the doctor's advice if necessary. If you are unsure whether your physical condition is suitable or the pros and cons of wearing a mask, you should consult your doctor.
Except for some high-end models used to deal with harsh environments, dust masks generally do not have oxygen supply, but on the contrary, they increase breathing resistance to varying degrees. The breathing power comes from the movement of respiratory muscles such as the diaphragm, which means that the wearer needs to drive more force to drive the respiratory muscles to achieve gas exchange. For the elderly, the weak, the sick and the young with weak respiratory muscles or poor cardiopulmonary function, this is an extra The consumption may be quite large, and the harm caused by respiratory muscle fatigue, obstructed ventilation and hypoxia may exceed the risk caused by the particulate matter itself, so these people need to be cautious in whether or not to wear a mask.
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