Environmental
The EPA's Action Level for radon in a building is:
A2 pCi/L
B4 pCi/L✓ Correct
C8 pCi/L
D10 pCi/L
Explanation
The EPA recommends mitigation when radon levels in a building reach 4 picocuries per liter (pCi/L) or higher. Colorado has naturally elevated radon levels due to uranium deposits in the soil and rock.
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