Environmental

The EPA's action level for radon in indoor air, above which mitigation is recommended, is:

A2 pCi/L
B4 pCi/L✓ Correct
C10 pCi/L
D20 pCi/L

Explanation

The EPA recommends radon mitigation when indoor levels exceed 4 picocuries per liter (pCi/L). New Hampshire's granite-rich geology makes radon testing particularly important in real estate transactions.

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