Assertion: foam's amount | /r/AtLocation | air
Facets:
value: from automobile exhaust
type: CAUSE
value: in foods
type: LOCATION
value: in packaging
type: LOCATION
value: from cigarette smoke
type: CAUSE
Source sentences:
text: People can come into contact with styrene from the small amounts that may be present in air (primarily from automobile exhaust and cigarette smoke) and in foods and packaging.