Louisville, KY – As winter weather continues across Kentucky and homes remain tightly sealed to keep out the cold, health officials are warning residents—especially those in Louisville and surrounding communities—about a dangerous indoor health threat that often goes unnoticed. January marks National Radon Action Month, highlighting radon gas, commonly referred to as the “invisible killer” inside the home.
According to the U.S. Environmental Protection Agency (EPA), radon is a naturally occurring radioactive gas released from soil and rock. It can seep into homes through foundation cracks, basements, crawl spaces, and utility openings. Large portions of Kentucky—particularly central and eastern regions—are classified as moderate to high radon risk, with elevated levels frequently detected in homes across Jefferson County, the Bluegrass Region, and Appalachia.
Health experts say winter creates ideal conditions for radon buildup. In Louisville and throughout Kentucky, homes are sealed to conserve heat, allowing radon to accumulate indoors for extended periods. Long-term exposure to radon is the second leading cause of lung cancer in the United States, responsible for an estimated 21,000 deaths each year. Smokers face the highest risk, but non-smokers are also vulnerable.
Unlike carbon monoxide, radon exposure does not cause immediate symptoms. Medical professionals warn that damage often occurs silently over many years, making home testing the only reliable way to detect elevated radon levels.
State health officials recommend that all Kentucky residents test their homes, particularly during winter when radon concentrations tend to be highest. Test kits are affordable and widely available, and mitigation systems can significantly reduce radon levels when elevated readings are found.
As National Radon Action Month continues, officials urge Kentuckians to test now to help protect their families from a serious but preventable health risk.
