Ключевые слова: air pollution, allergy, bacteria, blue, care, cough, danger, defense, disease, dust mask, epidemic, equipment, face, flu, health, hospital, hygiene, hygienic mask, illness, infection, infectious, influenza, mask, medical, medical equipment, outbreak, pandemic, pollution, protect, protection, protective, quarantine, respiratory, safety, sickness, sneezes, surgical, uniform, virus,