id	keyword
eshs-31597	pollution
eshs-31597	health
eshs-31597	air
eshs-31597	air pollution
eshs-31597	california
eshs-31597	studies
eshs-31597	education
eshs-31597	population
eshs-31597	environmental
eshs-31597	low
eshs-31597	et al
eshs-31597	asthma
eshs-31597	birth
eshs-31597	burden
eshs-31597	effects
eshs-31597	vol
eshs-31597	disease
eshs-31597	pm2.5