Ключевые слова: air, allergy, asia, asian, breath, care, child, city, cover, crowd, danger, dust, epidemic, face, filter, flu, gas, girl, health, ill, infection, influenza, kid, mask, outbreak, pandemic, people, person, pm 25, pollution, prevention, protect, protection, public, safety, sick, smell, smog, smoke, street, surgical, toxic, traffic, urban, virus, wearing, woman, young,