Ключевые слова: adult, air pollution, bus, business, businessman, businessperson, caucasian, city, city life, commuter, disease, distance, face mask, male, man, mask, outbreak, outdoors, outside, pandemic, passenger, people, phone, portrait, prevention, protection, protective, public, public transport, safety, seat, sitting, smartphone, smog, transport, transportation, traveling, using, virus, work, young,