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  1. Radon - Wikipedia

    Radon is a contaminant that affects indoor air quality worldwide. Because radon is denser than air it accumulates in basements and crawlspaces under dwellings.

  2. Radon and Your Health | Radon | CDC

    Feb 16, 2024 · Radon is an odorless and invisible radioactive gas naturally released from rocks, soil, and water. Radon can get trapped inside homes and buildings, and build up in the air. Over time, …

  3. Radon | US EPA

    Nov 13, 2025 · Radon is a naturally occurring radioactive gas that can cause lung cancer. You can’t see or smell radon. Testing is the only way to know your level of exposure. Radon can have a big impact …

  4. Radon - Wyoming Department of Health

    The radon component of the Wyoming Cancer Program provides information to Wyoming residents, contractors, and real estate agents about radon. What is radon?

  5. Radon Gas: Causes, Exposure, Symptoms & Complications

    Radon is a radioactive substance, which means it emits radiation (a type of energy). Radiation can damage your cells, leading to cancer. Experts estimate that radon exposure is the second most …

  6. Radon | American Lung Association

    Jul 16, 2025 · Learn about radon, how it affects lung health and what you can do about it. What Is Radon? Radon is a colorless, tasteless and odorless gas that causes lung cancer. Exposure to …

  7. Radon | Definition, Properties, Effects, & Facts | Britannica

    Oct 31, 2025 · Radon, chemical element, a heavy radioactive gas of Group 18 (noble gases) of the periodic table, generated by the radioactive decay of radium. It is a colorless gas, 7.5 times heavier …

  8. Radon Maps: Radon Zones in USA & Canada - National Radon

    Radon Level Map Is your home in a radon danger zone? Radon levels can vary greatly across a single neighborhood, but there are certain areas of the country that have a higher predicted average indoor …

  9. What is Radon? Understanding the Invisible Risk in Your Home

    Radon is an invisible, odorless gas that results from the radioactive decay of uranium found naturally in soil, rock, and water. This naturally occurring radioactive gas seeps into our homes, infiltrating …

  10. Radon | National Institute of Environmental Health Sciences

    Jun 5, 2025 · Radon is a naturally occurring radioactive gas that is colorless and odorless. Radon comes from the natural decay of uranium or thorium, elements found in rocks, soils, and water.