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What is radon?

Radon is an invisible, odorless, colorless gas that is released through the decay process of uranium, radium, and thorium, which are present in rocks and soil throughout the world. About 37% of our radiation exposure in the U.S. comes from radon, and, although radon typically exists in low levels outdoors, if it enters a home or other building through cracks in the foundation, floors, or walls, it can accumulate to dangerous, even life-threatening levels.

Radon gas is labeled as a Group 1 carcinogen, the most dangerous designation that a substance or exposure circumstance can receive, by the International Agency for Research on Cancer (IARC). This means that radon gas is known to cause cancer. 1 person dies every 25 minutes in the United States alone from radon-induced lung cancer—21,000 people every year! Radon causes more deaths annually than carbon monoxide, pesticides on food, asbestos, and outdoor pollutants combined, yet many homeowners don’t know about the threat of this environmental health hazard and how easy it is to keep their homes and families safe.

How does radon cause lung cancer?

As radon decays, it releases alpha particles that, when inhaled, can attach themselves to the tissue lining the lungs and damage the lung cells, which may result in cancer. Unfortunately, the vast majority of lung cancer cases are not identified until Stage IV, at which time symptoms first develop. Very few Stage IV patients have a life expectancy greater than 5 years after diagnosis. Smokers and former-smokers are at an even greater risk of developing radon-induced lung cancer, and some studies show that radon may be linked to other types of cancer in addition to lung cancer. 

Other Resources

National Radon Action Plan

Radon Resources for Home Buyers and Sellers


Find additional resources from CDC and other federal agencies and from the National Radon Workgroup.
Agency for Toxic Substances Disease Registry

Department of Housing and Urban Development

Environmental Protection Agency

National Cancer Institute

The National Radon Workgroup

The American Lung Association leads the National Radon Workgroup with representation from eleven other non-federal and federal organizations, including CDC. Visit RadonLeaders.orgexternal icon for more information on the workgroup and progress on the strategies outlined in the National Radon Action Plan.

For live help:

  • 1-800-55RADON (557-2366) *– Get live help for your radon questions.
  • 1-800-644-6999*– Radon Fix-It Hotline for general information on fixing or reducing the radon level in your home.
  • 1-800-426-4791– Safe Drinking Water Hotline for general information on drinking water operated under an EPA contract.

*Operated by Kansas State University in partnership with EPA

National Radon School Calendar

Classrooms, Waiting rooms, Bookbag Stuffers, Foodbanks, Libraries, Home Visits



The minimum order quantity is 5 calendars.


Contact (412) 961-1980




Order customized t-shirts and masks

Your employees, children, hospitals and

other corporate or nonprofit organizations

can make a statement.  Add your logo too!

Your Discount Code: EcoCR3

12% of each sale will be donated to support CR3 radon advocacy, saving more lives from the dangers of radon.

Citizens for Radioactive Radon Reduction Inc.

618 Evansville Ave. Waterloo, IL 62298

618-830-4660 |  info@Citizens4RadonReduction.org

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