Assertion: radon's level | /r/HasProperty | 1.3 pci
Facets:
Source sentences:
text: The average level of radon in outdoor air is 0.4 pCi/L (pico Curies per Liter), and the average level in indoor air is 1.3 pCi/L.
text: The U.S. average radon-in-air level in single family homes is 1.3 pCi/L.