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Radon levels in Illinois can be a concern because the state sits on a lot of uranium-bearing glacial till and bedrock, especially in the northern and central counties. Since radon is an invisible, odorless gas that seeps up from the ground, many homes—particularly those with basements or poor ventilation—can trap dangerous concentrations. The EPA has mapped much of Illinois as having high potential for elevated indoor radon, so testing is really the only way to know if your house is safe. If yo…