Environmental
The EPA's safe level for radon in indoor air is below:
A2 pCi/L
B4 pCi/L✓ Correct
C8 pCi/L
D10 pCi/L
Explanation
The EPA recommends taking action to reduce radon if indoor levels are at or above 4 picocuries per liter (pCi/L). Levels above 4 pCi/L are considered elevated and mitigation (typically a sub-slab depressurization system) is recommended.
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