What is it?
Radon is a radioactive, extremely toxic gas that is formed naturally from the decay of uranium or thorium in rocks and soil. It is more common in some areas of the country than others.
Radon comes in air through cracks and gaps in buildings and homes.
Radon levels may be used to predict earthquakes, study atmospheric transport, and explore for petroleum and uranium.
Where is Radon found?
- Air – indoors and outdoors
- Water – contaminated surface, well, and groundwater
How can I be exposed to Radon?
Radon commonly enter(s) the body through:
- Drinking contaminated water
- Indoor or outdoor air, as gas or particles attached to dust
What happens when I am exposed to Radon?
Exposure to radon can cause:
- Lung cancer
- Damage to lung tissue
Who is at risk for exposure to Radon?
- Cigarette smokers
- Cigarette smokers have an increased chance of developing lung cancer.
- Residents of areas rich in uranium or thorium
- More radon will be released by rocks and soil.
Reduce your risk
If you think your health has been affected by exposure to radon, contact your health care professional.
Always wash your hands thoroughly after handling chemicals. For poisoning emergencies or questions about possible poisons, please contact your local poison control center at 1-800-222-1222.
- Do you live in an area where the amount of uranium and thorium is high?
- Have you tested your home for radon levels?
- Do you use well water?
- Visit the EPA web page on how to find a radon test kit and mitigation professional: https://www.epa.gov/radon/find-radon-test-kit-or-measurement-and-mitigation-professional.
- Test radon levels in your home with a professional radon test kit.
- If radon levels are high, contact a professional radon mitigation firm that will seal the pathways where radon can enter the building, and install a ventilation system that routes air from underneath the home to the outdoors.
- Contact your state radon office or a nationally certified professional radon testing and mitigation firm: American Association of Radon Scientists and Technologists, and National Radon Safety Board.
National Library of Medicine Resources and Databases
- Radon, Radioactive. Hazardous Substances Data Bank
Search results on radioactive radon from a toxicology database that focuses on the toxicology of potentially hazardous chemicals.
Resources on radon for consumers, builders, and contractors, including information on its associated health risks, building and buying a safe home, action plans, and map of radon zones.
- Radon. ToxFAQs
(Agency for Toxic Substances and Disease Registry)
Factsheet with answers to the most frequently asked questions about radon exposure and its effect on human health, developed by a federal public health agency that protects communities from harmful health effects related to exposure to natural and man-made hazardous substances.
- What Is Radon?
(Navy and Marine Corps Public Health Center)
Resource on radon, including information about exposure, associated health effects, and how to protect your family from this radioactive gas.
(National Institute of Environmental Health Sciences)
Information on radon, its impacts on health, how to protect yourself, and links to additional resources, from a federal institute that investigates the interplay between environmental exposures, human biology, genetics, and common diseases to help prevent disease and improve human health.