Definitions for "PCi/L"
picocurie(s) per liter
Picocuries per liter (of air), unit for measuring radon concentrations. The EPA Action Level for indoor radon is 4 pCi/L.
picocurie per liter of air. A curie is a commonly used measurement of radioactivity and a picocurie is a very small amount of radiation equal to one trillionth of a curie.