MINNEAPOLIS (WCCO) – The city of Minneapolis announced on Thursday that it’s giving away 200 radon test kits, for homeowners to use to check if their homes contain dangerous levels of the cancer-causing gas.

Residents can pick up free kits at the City of Minneapolis Development Review, located at 250 S. Fourth St., Room 300, from 8 a.m. to 4 p.m.

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After the supplies run out, homeowners can still purchase a kit for $9.

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Radon is the leading environmental cause of cancer deaths in the United States, and the leading cause of lung cancer among nonsmokers, according to a release. It’s an odorless, colorless and tasteless gas that occurs naturally in Minnesota soil. It can enter homes through cracks and openings in their foundations or walls.

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The Minnesota Department of Health estimates that two out of every five homes in Minnesota have dangerous levels of the gas.