Environmental

Radon is a concern in Alaska real estate because it is:

AA toxic chemical used in older building materials
BA colorless, odorless radioactive gas that can accumulate in buildings✓ Correct
CA mold species common in Alaska's humid climate
DA byproduct of heating oil combustion

Explanation

Radon is a naturally occurring radioactive gas formed by the decay of uranium in soil and rock. It can accumulate in buildings, particularly basements and lower floors, and is a leading cause of lung cancer. Testing and mitigation are recommended in areas with elevated radon levels.

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