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A 1988 U.S. government advisory recommended that homeowners have their homes tested for radon gas. It further recommended that homeowners have any dangerous levels corrected. Since then, however, the problem has largely slipped out of the public's view. This lack of front-page exposure shouldn't lull builders and remodelers into thinking the radon issue is fading away. Quite the opposite is true. Some states are passing radon-mitigation laws. The U.S. Environmental Protection Agency (EPA) itself is developing model construction guidelines to reduce radon infiltration into buildings. No states yet have laws or building codes that mandate radon testing, mitigation, or prevention. However, Pennsylvania, Florida, Minnesota, Iowa, and New Jersey are considering requiring radon testing in all realestate transactions. And New Jersey now requires builders