Assertion: radon's level | /r/HasProperty | harmful
Facets:
value: to the point
type: OTHER
Source sentences:
text: But when radon comes into a home or building, the condensed, elevated levels can be harmful to the point of causing lung cancer.
text: However, even low levels of radon can be harmful.
text: Once radon has entered through the lower level spaces it can build up over time reaching harmful levels.