Ключевые слова: 25, air, allergic, allergy, asian, bad, care, city, cough, couple, dirty, dusk, elder, environmental, face, family, gas, health, illness, index, influenza, mask, medical, old, outdoor, people, pm, polluted, pollution, prevention, protect, protection, quality, road, senior, sick, sickness, smell, smog, smoke, street, symptom, toxic, unhealthy, village, virus, weather, woman, worry, young,