radon levels illinois 5

https://theradonofallonilwire.cavandoragh.org/why-radon-o-fallon-il-homeowners-should-test-this-season

Radon levels in Illinois can vary widely across the state, with some areas in the northern and central regions having higher potential for elevated indoor radon. It's a radioactive gas that seeps from soil into homes, often unnoticed, and long-term exposure is a leading cause of lung cancer. Testing your home is the only way to know if you're at risk, and mitigation systems can effectively reduce levels if needed.