Environmental
Radon is a naturally occurring radioactive gas that is particularly common in Colorado. The EPA action level for radon in a home 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 they are at or above 4 picocuries per liter (pCi/L). Colorado has many areas with elevated radon levels due to the geology of uranium-bearing soils.
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