How Does Radon Gas Cause Lung Cancer?
If you’ve heard about radon gas, you might know it’s the second leading cause of lung cancer in the U.S. after smoking. But how does it actually damage the lungs? The answer comes down to where radon comes from, how it gets inside buildings, and what happens as it breaks down into radioactive particles that interact with your DNA.
How Radon Gets Inside Buildings
Radon is a naturally occurring gas released from uranium in the soil. As it rises, pressure differences between the soil and the building’s interior pull the gas inside. This happens through:
Alpha Radiation
Alpha radiation is a type of ionizing radiation made up of heavy, positively charged particles released during radioactive decay. While alpha particles cannot penetrate skin or even paper, they cause severe damage when inhaled or ingested because they deliver intense bursts of energy directly to living cells.
21,000 Annual Deaths
Radon is recognized as the second leading cause of lung cancer in the United States, responsible for roughly 21,000 thousand deaths each year. Only smoking causes more lung cancer cases, and when combined with radon exposure, the risk becomes even greater.
From Gas to Particles: Radon Decay Products (RDPs)
Radon gas itself is inert, meaning it doesn’t easily react with your body. The real danger comes after it decays into solid radioactive particles known as radon decay products (RDPs). Two of the most harmful are:
These tiny particles attach to dust and aerosols in the air. When inhaled, they lodge deep into the lungs, delivering radiation directly to lung tissue.
The Only Way to Know: Test for Radon
Radon is invisible, odorless, and impossible to detect without testing. The EPA classifies radon as a Class A carcinogen, placing it in the same category as smoking and asbestos because there is conclusive evidence it causes cancer in humans. Certified radon testing provides accurate measurements so you know your risk. If levels are high, a radon mitigation system can be installed to safely reduce concentrations and protect your health.
👉 Bottom line: Radon gas enters from the soil, decays into radioactive particles, and emits alpha radiation that damages DNA inside your lungs. That’s how radon exposure becomes a leading cause of lung cancer—and why testing is essential for every home, school, and workplace. The Radon Boss is among the country’s most trusted radon service providers, delivering reliable testing, and lasting peace of mind. Call The Radon Boss today to schedule your test.
