Ключевые слова: adult, air, allergy, asia, background, boy, carbon, care, childhood, city, cold, danger, dioxide, disease, dust, environment, face, female, fumes, gases, girl, health, healthy, infection, kid, lady, man, mask, medical, mouth, n95, nose, outdoor, people, person, pm25, pneumonia, pollution, portrait, prevention, protect, protection, sick, smog, spread, toxic, urban, virus, wearing, white,