Yes, the certification standards for different protection levels of respirators are different. N95 is the detection standard of the United States, Kn90, kn95 is the protection standard of China, FFP2, ffp3 is the European protection standard. The specific comparison is as follows: ffp3 > FFP2 = N95 = kn95 > Kn90. The higher the protection level, the better the filtering effect, but PM2.5 can be protected.
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