Ключевые слова: breather, breathing, care, corona, coronavirus, covid19, disease, doctor, epidemic, equipment, face mask, ffp1, ffp2, ffp3, filter, filtering, flu, health, hospital, hygiene, infection, isolation, lockdown, locked, mask, medical, medicine, mouth, n100, n95, n99, nr, outbreak, pandemic, particles, personal, pollution, prevention, protect, protection, protective, respirator, respiratory, safety, self isolation, social distancing, stay home, vaccination, virus, warning,