Environmental
The EPA's action level for radon in residential buildings is:
A2 pCi/L
B4 pCi/L✓ Correct
C6 pCi/L
D10 pCi/L
Explanation
The EPA recommends mitigation when indoor radon levels reach 4 picocuries per liter (pCi/L) or higher, though levels above 2 pCi/L may warrant consideration.
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