radon testing company

https://www.google.com/maps/d/edit?mid=1izQnLuXktvKsNQrkMe_RExB1M6qhP9ce&ll=36.149675830165805%2C-86.76874635000001&z=17

The average house has a radon level of around 1 picocurie per litre. If your house has 4 picocuries per liter or even more, after that activity must be taken.