Ключевые слова: air pollution, asia, asian, chinese, city life, close up, contagious, corona virus, coronavirus, covid19, defense, epidemic, face, health, ill, infect, infection control, infectious disease, inside, male, man, mask, one, outbreak, people, person, plague, pm25, pneumonia, portrait, prevent, protect, protective mask, safety, sick, sickness, sitting, smog, spread, subway, surgical mask, train, transport, transportation, travel, urban, wear, young,