(Fond du Lac) The Fond du Lac County Health Department is observing National Radon Action Month by offering short-term radon test kits at only $5 this month. They are available at the Health Department offices on the fourth floor of the City-County Government Center in Fond du Lac Mondays through Fridays from 8 am to 4:30 pm. Kits are also available at your local city or town clerk’s office. Short-term radon test kits are available year-round for $10. One out of 10 Wisconsin homes has radon levels that exceed the recommended federal action level. Radon is a naturally occurring, invisible, odorless, tasteless, radioactive gas that claims about 21,000 lives each year. Radon gas enters homes and other buildings through cracks and openings in basements, crawl spaces and slabs.