radon measurement 5
https://front-wiki.win/index.php/Why_a_Radon_Test_for_Home_Sale_Is_a_Smart_Move_in_St._Louis_Real_Estate
Radon measurement involves testing indoor air for this naturally occurring radioactive gas that seeps from the ground. You can buy a simple test kit at a hardware store, place it in the lowest livable area for a few days, then mail it to a lab. The results tell you if your home's radon level is above the EPA action guideline of 4 picocuries per liter, which would require mitigation to reduce health risks from lung cancer.