About: outdoor air pollution

Premodifier: outdoor air
Head noun: pollution

Same concepts
http://dbpedia.org/resource/Air_pollution

Broader concepts

label	provenance	confidence
environmental hazard	isap:135923581	0.767064
environmental condition	isap:353554558	0.727054
environmental cause of cancer	isap:15440721	0.654196
environmental factor	isap:133645473	0.628288
attack	isap:136127213	0.184440

Narrower concepts

label	provenance	confidence
particulate matter	isap:420920670	0.661871
workplace dust	isap:289650348	0.419575
acid rain	isap:290267959	0.381696
traffic	isap:320083787	0.353563