Assertion: air pollution | /r/CapableOf | create deadly smog
Facets:
value: a few years earlier
type: TEMPORAL
value: in 1948
type: TEMPORAL
Source sentences:
text: A few years earlier, in 1948, severe industrial air pollution created a deadly smog that asphyxiated 20 people in Donora, Pennsylvania, and made 7,000 more sick.