The governments usually recommend face masks with the filtration certification standards such as N95, KN95, FFP2 or above.

Our METRO-MASK: URBAN is KN95 certified which is similar to FFP2 and N95, and is  therefore a good mask in the aspect of Sars-Covid-19. Please see the comparison between the different classifications here.

Viruses are extremely small particles but are airborne by traveling on other larger particles, which is how filter masks give protection. However, note that no mask can guarantee full safety and protection agains viruses. 

The protection against viruses depends on the particle size of the aerosols containing infectious viruses. The sizes of these virus-containing particles differ from just the naked virus diameter (0,02–0,03 µm) to the sizes of the carrier particles. According to a study of the influenza virus, the virus-containing particles vary largely in size and 5% of the particles where larger than 4 µm, 75.5% was 1–4 µm and 19.5% smaller 1 µm. In another study of FMDV, 65–71% of the virus-containing particles were over 6 µm in diameter, 19–24% was 3 - 6 µm and 10–11% were under 3 µm.

There are a couple of certification standards that are more well known globally and recommended by governments and authorities around the world during Covid-19: 

N95 - US Standard
FFP2 - European Standard
KN95 - Chinese Standard

Our Metro-Mask: Urban is tested and certified with KN95 that is similar to FFP2 and N95 standard.

There are very few differences between the different standards and most of them are so minor that the user won't be able to recognize a difference. In the table below you'll find a comparison between FFP2, KN95, N95.

The Metro-Mask: Urban is tested and certified for 98 % protection against particles down to the size of 0.3µm and because of this, the mask will protect you against virus-containing particles that are larger than 0.3µm.

There are two common technologies used in filters today. One is the mechanical filtration, i.e. the filter is tightly woven so that particles get stuck in it; and the static filtration, i.e. the particles get attracted by charged material. Our filter utilizes both technologies to achieve a good balance between breathability and filter efficiency.

There are two common technologies used in filters today. One is the mechanical filtration, i.e. the filter is tightly woven so that particles get stuck in it; and the static filtration, i.e. the particles get attracted by charged material. Our filter utilizes both technologies to achieve a good balance between breathability and filter efficiency density in order to filter particles of different sizes. The multi-layer filter technology is tested at one of the world’s most advanced filter laboratories and consists of the following layers:

Outside PP Layer - Outside filter wrapping in a durable finish
Active Carbon Layer - Filters gases and reduces odor
1st Electro Charged Layer - Filters larger PM10, pollen, and other allergens
2nd Electro Charged Layer - Filters smaller PM2.5, dust, and bacteria
Inside PP Layer - Inside filter with ultra-smooth and skin-friendly finish

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