Environmental

South Dakota has some of the highest radon levels in the United States. An EPA Action Level for radon is:

A2 pCi/L
B4 pCi/L✓ Correct
C8 pCi/L
D10 pCi/L

Explanation

The EPA recommends taking action to reduce radon levels when readings are at or above 4 picocuries per liter (pCi/L). Levels between 2–4 pCi/L also warrant consideration of mitigation.

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