Environmental

The EPA-recommended action level for radon in a home is:

A2 picocuries per liter (pCi/L)
B4 picocuries per liter (pCi/L)✓ Correct
C8 picocuries per liter (pCi/L)
D10 picocuries per liter (pCi/L)

Explanation

The EPA recommends fixing a home if the radon level is 4 pCi/L or higher. Levels between 2 and 4 pCi/L still pose some risk, and remediation should be considered.

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