Minnesota Radon Levels
Zone 1 counties have predicted average indoor radon screening level greater than 4 pCi/L (picocuries per liter) (red zones)
Zone 2 counties have predicted average indoor radon screening level between 2 and 4 pCi/L (picocuries per liter) (orange zones)
Zone 3 counties have predicted average indoor radon screening level less than 2 pCi/L (picocuries per liter) (yellow zones)
Radon is naturally occuring radioactive gas that is colorless, odorless, and tasteless. It is formed by natural breakdown of uranium in rock, soil, and water
Radon gas moves up through the soil and can be drawn into our homes by slight pressure differences. Once inside, radon can become trapped and build up to unsafe levels
What is tested to determin a counties radon level?
The map was developed using five factors to determine radon potential:
- Indoor Radon Measurements
- Aerial Radioactivity
- Soil Permeability
- Foundation Type
Rankings are based off the average zone rating for all counties in the state. Rankings are from the highest potential risk to the lowest potential risk.