Ключевые слова: balkans, belgrade, beograd, boy, child, children, corona, coronavirus, coronavirus in serbia, coronavirus protection, covid 19, crisis, crowd, crowded, epidemic, face mask, facemask, groceries, health, illness, infection, koronavirus, koronavirus u srbiji, male, mask, pandemic, people, pollution, prevention, protection, pupil, respiratory, safety, sars cov 2, school, schoolboy, serbia, social distancing, srbija, student, urban, virus, walk, walking, young, youngster, youngsters, youth,