Graphic: How invisible radon gas can enter a house

Soil is generally believed to be the largest contributor of indoor radon in typical detached houses.

February 10, 2013 at 12:42PM
(Raymond Grumney/The Minnesota Star Tribune)
(Jamie Hutt/The Minnesota Star Tribune)
about the writer

about the writer

Raymond Grumney

News Graphics Director

Ray Grumney is the news graphics director at the Star Tribune, with a proven 30-year award-winning track record. He is a driven visual journalist focused on developing and implementing high-impact design solutions to sometimes complicated data-driven stories.

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