Assertion: radon | /r/CapableOf | build up inside home
Facets:
value: to dangerous levels
type: OTHER
value: of any age
type: OTHER
Source sentences:
text: Once inside a home, the radon builds up due to a lower rate of fresh air inside the building.
text: As a result, radon in unhealthy levels can build up in any home, of any age.
text: You can't see or smell radon, and it can build up inside homes, buildings and schools to dangerous levels.