Environmental
Radon is a naturally occurring radioactive gas. The EPA action level for radon mitigation is:
A2 pCi/L
B4 pCi/L✓ Correct
C6 pCi/L
D10 pCi/L
Explanation
The EPA recommends mitigation when indoor radon levels reach or exceed 4 picocuries per liter (pCi/L).
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