Assertion: pollution's cause | /r/CreatedBy | the smoke
Facets:
value: from factories
type: TRANSITIVE-OBJECT
value: from vehicles
type: OTHER
value: from chimneys
type: TRANSITIVE-OBJECT
value: from the burning of wood
type: OTHER
Source sentences:
text: Another common cause of air pollution may be attributed to the smoke from chimneys, factories, vehicles, or the burning of wood.