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Indoor Radon levels in USA

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Radon is a radioactive gas that seeps in through a building’s foundation and can build up indoors. Long-term exposure is the second leading cause of lung cancer after smoking.

Do you know your home’s radon level?

What is this map of USA showing me?

You’re viewing recent indoor radon levels measured by homeowners using Airthings* smart radon monitors.

While geology plays an important role, factors like building type, weather, and foundation gaps also impact radon risk levels.

This map does not predict radon risk for your home. In fact, it demonstrates that homes in the same region are reporting varying levels of indoor radon.

Now What?

Learn more about radon where you live; zoom and click the map or choose your state below:

  • Alabama
  • Alaska
  • Arizona
  • Arkansas
  • California
  • Colorado
  • Connecticut
  • Delaware
  • District Of Columbia
  • Florida
  • Georgia
  • Guam
  • Hawaii
  • Idaho
  • Illinois
  • Indiana
  • Iowa
  • Kansas
  • Kentucky
  • Louisiana
  • Maine
  • Maryland
  • Massachusetts
  • Michigan
  • Minnesota
  • Mississippi
  • Missouri
  • Montana
  • Nebraska
  • Nevada
  • New Hampshire
  • New Jersey
  • New Mexico
  • New York
  • North Carolina
  • North Dakota
  • Ohio
  • Oklahoma
  • Oregon
  • Pennsylvania
  • Rhode Island
  • South Carolina
  • South Dakota
  • Tennessee
  • Texas
  • Utah
  • Vermont
  • Virginia
  • Washington
  • West Virginia
  • Wisconsin
  • Wyoming
    • Levels measured
    LOWERHIGHER
    Warning iconThe EPA recommends that every house gets tested for Radon