id	keyword
ajec-5093	pm2.5
ajec-5093	exposure
ajec-5093	symptoms
ajec-5093	health
ajec-5093	pollution
ajec-5093	days
ajec-5093	daily
ajec-5093	air
ajec-5093	students
ajec-5093	study
ajec-5093	levels
ajec-5093	school