Radon is a radioactive gas that is released from soil and rocks. It is present everywhere, but higher levels of it are sometimes found in homes, where it has leaked through cracks or holes and has accumulated. Radon can also come from materials used to construct homes, or well water. If radon is inhaled often or in large quantities, it can damage cells lining the lungs and cause lung cancer. It is now possible to measure radon levels in your home to help prevent lung cancer.
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