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· long-term exposure to high levels of radon can be dangerous to your health. · radon is a naturally occurring radioactive gas that can cause lung cancer. You can’t see or smell radon. According to the united states environmental protection agency (epa), radon … Learn where you’re likely to find high levels of radon, … At levels of 4,000 pci/l or higher you should consider action beginning with reviewing your total radon risk (from radon in air and water). Testing is the only … · radon is an odorless and invisible radioactive gas naturally released from rocks, soil, and water. Radon is a contaminant that affects indoor air quality worldwide. Radon can get trapped inside …