Ключевые слова: air, bad, business, caucasian, chemical, city, cough, covid19, dirty, disease, downtown, environment, epidemic, face, female, fog, gas, girl, global, health, human, infection, influenza, mask, medical, metropolis, n95, outdoors, people, pm 25, polluted, pollution, prevention, problem, protect, protection, protective, quality, safety, sick, smog, smoke, sneeze, thailand, toxic, urban, warfare, warming, weather, woman,