Radon

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Revision as of 13:30, 8 May 2011 by Michael (talk | contribs)
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Radon is a gas. There are certain laws that dictate how much radon can be present where humans live, it seems.

http://www.kgw.com/news/local/State-urges-homeowners-to-test-for-radon-gas-81283842.html