What are FFP2 masks, mandatory in some European countries?

What are FFP2 masks, mandatory in some European countries?

These high-grade masks significantly reduce covid-19 transmission IN CONTINENTAL EUROPE few people now wear cloth masks as protection against covid-19. Instead, they don surgical or, increasingly, FFP2 masks, a highly efficient medical grade. Meanwhile, in Britain and America, FFP2 coverings are less common. What are these masks, and why are they not more widely used?

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