Radon and Cancer

Radon is linked to lung cancer. It’s the #1 cause of lung cancer in nonsmokers. Despite this serious health risk, radon remains widely understood and often overlooked. The good news is that radon-related health risks are preventable. Protecting your loved ones starts with understanding what radon is, why it’s dangerous, and how testing and mitigation can significantly reduce exposure.

From a public health perspective, radon represents one of the most preventable environmental cancer risks. Widespread testing and early intervention play a critical role in reducing the overall burden of radon-related disease.

Why Radon is Deadly

Radon is a naturally occurring radioactive gas that is produced by the decay of uranium and thorium in the Earth's crust. When radon is released from the ground, it can accumulate in enclosed spaces such as homes and other buildings, often seeping in through cracks, crawl spaces, or other openings. When people inhale air containing radon gas, they are exposed to its radioactive decay products, including solid particles that can be deposited in the lungs.

Who is Most at Risk?

Certain U.S. geographic areas are more prone to high radon levels, particularly regions with significant uranium deposits in the soil. Our interactive radon map displays radon zones across the United States, categorizing areas into low, moderate, and high potential for radon. Homeowners and prospective buyers in high radon zones should prioritize testing and mitigation to protect their health and safety.

What are the Symptoms of Radon Exposure?

Radon exposure itself does not cause immediate symptoms, as it is a colorless and odorless gas. However, long-term exposure can lead to lung cancer, which may present symptoms such as persistent cough, chest pain, difficulty breathing, and unexplained weight loss. These symptoms often develop over many years, making it crucial to test for radon in your home, especially if you live in areas known for high radon levels.

Reducing Health Risks

Not everyone exposed to high levels of radon will develop lung cancer. Health risk are dependent on factors such as the concentration of radon, duration of exposure, and individual susceptibility. The World Health Organization (WHO) and other health authorities including the Environmental Protection Agency (EPA) and Indoor Environments Association (IEA) emphasize the importance of conducting radon tests and taking measures to mitigate elevated levels to reduce the risk of lung cancer associated with radon exposure.