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What COVID-19 Teaches Us About Integration COVID-19 update: Anyone using public transport without wearing a mask faces a fine of between €50 and €500. We already know that. But now FFP2 masks are gradually being introduced. These masks filter even the smallest particles more effectively, although their dense material also significantly increases breathing resistance. Doctors recommend wearing them for no longer than 75 minutes at a time. Five masks for €20 from our trusted re