Assertion: motor vehicle | /r/HasProperty | the single largest contributor
Facets:
value: in many urban areas
type: LOCATION
value: to ground-level ozone
type: TRANSITIVE-OBJECT
Source sentences:
text: In many urban areas, motor vehicles are the single largest contributor to ground-level ozone.
text: In many urban areas, motor vehicles are the single largest contributor to ground-level ozone which is a common component of smog.