Ключевые слова: asia, asian, child, chinese, cold, cough, daughter, disease, elementary, elementary school, face mask, facial mask, fever, girl, hay, hay fever, head, health, ill, illness, infectious disease, japanese, kid, korean, lifestyle, lung, mask, mom, mother, patient, people, pm25, pneumonia, preschooler, primary, protect, schoolchild, schoolgirl, sick, smile, spring, transmissible, transmissible infectious diseases, virus, winter, young,