Ключевые слова: adult, air, antismog, care, caucasian, city, danger, dangerous, dirty, disease, emission, environment, epidemic, europe, exhaust, face, facial, flu, gas, global warming, h7n9, health, human, influenza, man, mask, medical, mouth, outdoor, people, person, pm, pollution, prevention, protect, protection, protective, safety, sick, smog, smoke, street, toxic, unhealthy, urban, virus, wearing,