Environmental

Colorado has elevated natural radon levels primarily due to:

AIndustrial pollution from manufacturing facilities
BUranium-bearing granite and other rock formations throughout the state✓ Correct
CAgricultural chemical runoff
DHistoric mining of lead and silver

Explanation

Colorado's Front Range and mountain areas have naturally occurring uranium-bearing granite and other geological formations that produce radon gas. Colorado consistently ranks among states with the highest average indoor radon levels, making radon testing a standard recommendation.

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