Radon in Schools
"A nationwide survey of radon levels in schools estimates that nearly one in five has at least one schoolroom with a short-term radon level above the action level of 4 pCi/L (picoCuries per liter) - the level at which EPA recommends that schools take action to reduce the level. EPA estimates that more than 70,000 schoolrooms in use today have high short-term radon levels.
The only way to determine if a problem exists is to test for it.
School is not the only place that students and teachers can be exposed to radon. Since children spend more time at home, high radon levels there can pose a much greater threat to their health."
-Kansas State University