Assertion: air pollution | /r/HasProperty | secondary pollutants
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Air pollution is usually described as either primary pollutants or secondary pollutants.
text: Air pollution is usually described as either primary pollutants or secondary pollutants.
text: Air pollution is usually described as either primary pollutants or secondary pollutants.
text: Air pollution is usually described as either primary pollutants or secondary pollutants.
text: Air pollution is usually described as either primary pollutants or secondary pollutants.
text: Air pollution is usually described as either primary pollutants or secondary pollutants.