Radon in Illinois Homes: How to Test and When to Act
Radon is a radioactive gas that forms in the ground and can seep into homes through cracks in floors, walls, and foundations. Because it is invisible and has no smell, the only practical way to know whether your home has elevated levels is to test.
Illinois’ weather and housing stock—ranging from basements to slab-on-grade homes—mean radon pathways can vary widely even between nearby properties. That’s why experts recommend testing at the address, not relying on neighborhood averages.
When should you test in an Illinois home?
If you haven’t tested before, schedule a test as soon as possible. You should also retest if you move, finish a basement, seal major openings, install a new HVAC system, or make other structural changes that could alter airflow and pressure.
For many homes, radon testing is most informative during typical living conditions. Use the instr ... Read more »

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