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Test Your Home For Radon Radon is a radioactive gas. The U. S. Surgeon General has warned that radon is the second leading cause of lung cancer, responsible for thousands of lung cancer deaths per year. The only way to know if a home has high radon levels is to test for it. EPA and the Surgeon General recommend testing all homes below the third floor for radon. Radon comes from the natural decay of uranium and radium that is found in nearly all soils.