Assertion: radon | /r/CapableOf | build to high levels
Facets:
value: in the air inside the building
type: LOCATION
Source sentences:
text: Radon enters your home through hollow block walls, cracks in the basement and foundation and openings around the floor drains, pipes and sump holes, and can then build to high levels.
text: Radon from soil can get into any type of building - homes, offices, and schools - and build up to high levels in the air inside the building.