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Radon in Edwardsville, IL is a natural concern due to the area's geology, with some homes testing above EPA action levels. Many residents opt for radon testing when buying or selling a house, often finding higher levels in basements. Local Home Depot sells test kits, and mitigation companies can install systems to reduce exposure. It's something to be aware of if you're living in the region, as prolonged radon exposure increases lung cancer risk.