Assertion: smog's ozone | /r/HasProperty | one of the primary pollutants
Facets:
Source sentences:
text: Ozone, a toxic gas that is not normally produced at lower atmospheric levels, is one of the primary pollutants created in this kind of smog.
text: Ozone, a toxic gas that is not normally produced at lower atmospheric levels, is one of the primary pollutants created in this kind of smog.