The protection level of the mask: not that the higher the filtering effect, the better

N90 and N95 respectively represent 90% and 95% of particulate matter can be filtered. The naked eye does not seem to make a difference. Let’s take a look at the classification of American standards and European standards, that is, N95 and FFP2 levels.

“N series” is the American standard, “KN series” is the Chinese standard, and “FFP series” is the European standard. The larger the number, the higher the filtration efficiency, and the “Europe FFP series” is applicable to both oily and non-oily particulate matter. . It is easier to understand with a formula: FFP3＞FFP2=N95=KN95＞N90

However, it is not that the higher the filtration efficiency, the better the protection effect obtained! The filtering effect is not the only indicator of the good quality of the product. In addition to the filtering efficiency, we should also pay attention to the respiratory resistance and the adhesion between the mask and the face. Wear the mask on the face, there will be some leakage between the mask and the fitting part of the face. The prerequisite for effective protection is high tightness. When wearing a mask, the pollutants that enter the mask are mainly leaked in, and rarely penetrate through the filter material, so it is more meaningful to choose a mask with a good fit than a mask with high filtration efficiency. In addition, the higher the filtering efficiency of the mask, the greater the resistance of the mask to the breathing airflow, which is more likely to cause discomfort, which in turn affects the length of time it is worn.