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simplycreativephotography radon: an invisible threat by wellness letter print homeowners should test their homes for radon, advise the environmental protection agency (epa), the american lung association, and other health organizations. radon, a chemical element, is an invisible, odorless, radioactive gas
found in rocks, soil, and water. it seeps into buildings through cracks and holes in floors, walls, and foundations as well as through building joints. the gas also can be released from building material or from well water. it is found in all states, and about one in every u.s. homes has elevated levels...
https://www.berkeleywellness.com/healthy-community/environmental-health/article/radon-invisible-threat