Assertion: ozone | /r/ObjectUse | used in europe
Facets:
value: more widely
type: DEGREE
value: than the united states
type: OTHER
Source sentences:
text: Ozone was first used in water treatment in the late 1800s and ozone is more widely used in Europe and Asia than the United States.
text: Ozone has been used in Europe for over five decades by thousands of doctors.