Which models are suitable for smog weather?

As we all know, the main culprit of dangerous health in smog is PM2.5 and other particles. PM2.5 is particulate matter with an aerodynamic diameter of 2.5 microns or less.
Because the particle size of PM2.5 particles is extremely small, it will penetrate the pores of cotton and gauze masks. Cotton cloth and gauze masks use multi-layer mechanical filtration to intercept particles. The pores of gauze are too large compared to 2.5-micron particles, and PM2.5 can easily penetrate. Moreover, the current common structure of cotton cloth and gauze masks prevents the masks from effectively adhering to the wearer's face. Particles can not only penetrate through the mask, but also pass through the gap between the mask and the face.

The N-series is an American standard, the KN-series is a Chinese standard, and the FFP-series is a European standard. The larger the number, the higher the protection level. It is easier to understand with a formula. FFP3 ＞ FFP2 = N95 = KN95 ＞ KN90
but! Everyone must pay attention to it is not that the higher the filtering effect, the better! The prerequisite for effective protection is close contact. When wearing a mask, the leakage between the mask and the fitting part of the face is more important than the penetration through the mask filter itself. Therefore, it is more meaningful to choose a mask with good adhesion than a mask with very high filtration efficiency. If the filtering efficiency of the mask is higher, the resistance of the mask to the respiratory airflow is generally greater, which is more likely to produce discomfort, which in turn affects the length of wearing. If the general environment is where the air pollution exceeds the standard, air pollutants are everywhere and everywhere, so after ensuring that the protective mask has an effective basic protection function, you should try to choose the one that suits your face and has low respiratory resistance Wear a mask that is more comfortable overall, which will help you adapt more easily and be more willing to wear a mask to avoid exposure to air pollutants for a longer period of time.
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