id	keyword
fbem-25529	air
fbem-25529	pollution
fbem-25529	air pollution
fbem-25529	labor
fbem-25529	health
fbem-25529	residents
fbem-25529	supply
fbem-25529	areas
fbem-25529	quality
fbem-25529	air quality
fbem-25529	level
fbem-25529	china
fbem-25529	labor supply
fbem-25529	urban
fbem-25529	development
fbem-25529	people