Ключевые слова: 2021, air, allergic, asthma, bacteria, breathing, care, clinic, cough, disease, disposable, doctor, dust, emergency, epidemic, face, flu, future, health, healthy, hospital, ill, illness, infection, influenza, mask, medical, medication, medicine, mouth, physician, pm10, pm25, pollution, prevention, problem, professional, protect, protection, pulmonary, respiratory, rhinitis, safety, sickness, surgery, surgical, therapy, treatment, tuberculosis, virus,