Assertion: radon's level | /r/HasProperty | more than 200 bcq/m3
Facets:
Source sentences:
text: Indoor air can have high levels of radon (more than 200 Bcq/m3) when radon from the soil and rocks around any building seeps in and builds up in enclosed spaces that are poorly ventilated.
text: Indoor air can have high levels of radon (more than 200 Bcq/m3) when radon from the soil and rocks around any building seeps in and builds up in enclosed spaces that are poorly ventilated.