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EGLE launches indoor radon results Web map

Just in time for Radon Action Month, the Michigan Department of Environment, Great Lakes and Energy (EGLE) has launched a map that shows the results – by zip code – for first-time indoor radon tests.

January is National Radon Action Month

Radon is a naturally occurring radioactive gas. You cannot see, smell, or taste radon, and there are no short-term side effects that could cause alarm or warn of its presence. However, long-term exposure to radon increases the risk of developing lung cancer, which accounts for more deaths in both men and women than any other form of cancer in the United States, according to the Michigan Department of Environment, Great Lakes, and Energy (EGLE), which aims to:

  • increase awareness of health risks associated with elevated indoor radon levels,
  • promote home testing, and
  • encourage citizens to take action to reduce exposure once elevated radon levels are found.

Les Smith, III, EGLE’s radon program coordinator, encourages Michigan residents to check out the map. “Regardless of radon measurements in your area, home construction style, or home's age, it is important to test. Without testing, it is not possible to know the potential health risk,” he said. “Areas throughout the entire state have shown test results above the EPA action level of 4 pCi/l, therefore it’s important to test.”

The radon map data includes:

  • Minimum and maximum levels.
  • Total number of tests.
  • Total number of first-time tests.
  • Mean and median values.
  • The number of tests results below a level of concern (2 picocuries per liter (pCi/L)), in the recommended retest range (2 to 4 pCi/L), and the recommended mitigation level (greater than 4 pCi/L).
  • The percentage of tests greater than 2 pCi/L.
  • The percentage of tests greater than 4 pCi/L.

The results shown are for those without active radon mitigation systems.

For additional information or questions about the new Michigan radon map please email