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One source of natural radiation that presents a danger is radon — a radioactive gas with no colour, smell or taste. It is released from bedrock material and passes through the soil.
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About radon
What Is Radon Testing? - Marigold Home Inspections - Minneapolis
Living in the 'Granite State' means elevated risk for radon exposure, and in turn, lung cancer – New Hampshire Bulletin
Michigan radon specialist says more tests are needed in Detroit - WDET 101.9 FM
NDDH Encourages Homeowners to “Plan a Raid on Radon” – Northeast District Department of Health
Safe Level Of Radon Gas. Is there one? - Utah Radon Services
What is Radon?, Radon Problems in Homes
Get the Facts on Radon, NCEH
Protecting Your Home and Health: Radon Poisoning Prevention and Remediation
What is Radon? — TJRadon