Assertion: radon's level | /r/CapableOf | encounter in 90% of american homes
Facets:
value: typically
type: TEMPORAL
Source sentences:
text: The results of a methodical ten-year-long, case-controlled study of residential radon exposure in Worcester County, Massachusetts, found an apparent 60% reduction in lung cancer risk amongst people exposed to low levels (0–150 Bq/m3) of radon gas; levels typically encountered in 90% of American homes—