id	keyword
ajst-25544	air
ajst-25544	pollution
ajst-25544	air pollution
ajst-25544	health
ajst-25544	labor
ajst-25544	research
ajst-25544	impact
ajst-25544	residents
ajst-25544	mortality
ajst-25544	supply
ajst-25544	human
ajst-25544	concentration
ajst-25544	quality
ajst-25544	particulate