Radon is an odorless and invisible radioactive gas released from rocks, soil, and water. Radon is the second leading cause of lung cancer.
Resources
https://www.cdc.gov/radon/awareness.html
https://www.cdc.gov/nceh/features/protect-home-radon/index.html
https://www.cancer.org/cancer/cancer-causes/radiation-exposure/radon.html
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