Assertion: ozone | /r/AtLocation | the air
Facets:
value: naturally
type: MANNER
Source sentences:
text: Ozone is a colorless gas found in the air we breathe.
text: While ozone occurs naturally in the air, its use for infection control will need a high concentration of ozone and thus must be controlled by excluding all persons from a room that is being cleansed with ozone.
text: Ozone is a colorless gas found in the air we breathe.