Assertion: ozone | /r/HasProperty | main component of smog
Facets:
value: at ground level
type: LOCATION
Source sentences:
text: Some devices that are advertised as air purifiers purposely emit large amounts of ozone, the main component of smog.
text: Ozone, the main ingredient of smog, presents a serious air quality problem in several National Park Service areas.
text: Ozone is a major component of smog.
text: However, at ground level, ozone is considered a major air pollutant.