Environmental

Radon gas in New Hampshire residential properties is a concern because:

AIt causes skin irritation on contact
BIt is a radioactive gas linked to lung cancer, particularly in poorly ventilated basements✓ Correct
CIt contaminates drinking water with heavy metals
DIt deteriorates building materials over time

Explanation

Radon is a naturally occurring radioactive gas that can seep from the soil into buildings. New Hampshire has elevated radon levels in many areas; long-term exposure is the second leading cause of lung cancer in the U.S.

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