The best kind of radon is the radon that never enters a building.
Radon-resistant construction techniques are required by Iowa law for new school construction and should be discussed with architects during the planning stages of any building project.
No matter how old or new, every building has the potential for elevated levels of radon. Radon gas moves upward through cracks and other openings in the foundations of buildings from the soil below. Concentrations can vary based on source strength and soil permeability.
Prolonged exposure to elevated radon concentrations causes an increased risk of lung cancer. The decay products resulting from radon are the leading cause of lung cancer among non-smokers in the United States.