Assertion: fluorine's odor | /r/HasProperty | below safe working level
Facets:
Source sentences:
text: The free element has a characteristic pungent odor, detectable in concentrations as low as 20 ppb, which is below the safe working level.
text: The free element has a characteristic pungent odor, detectable in concentrations as low as 20 ppb, which is below the safe working level.