id	keyword
eurjchem-2511	circle
eurjchem-2511	chittagong
eurjchem-2511	air
eurjchem-2511	concentration
eurjchem-2511	chlorophyll
eurjchem-2511	particulate
eurjchem-2511	average
eurjchem-2511	matter
eurjchem-2511	haze
eurjchem-2511	pollution
eurjchem-2511	bangladesh
eurjchem-2511	leaves
eurjchem-2511	journal
eurjchem-2511	plant