Prolonged exposure to higher levels of concentration of Radon has an increase in lung cancer. Since 1999, there has been investigations worldwide on how radon concentrations are estimated. In the United States alone averages have been recorded to be at least 40 Bq/meters cubed. Steck et al. did a study on the variation between indoor and outdoor radon in Iowa, and Minnesota. Higher radiation was found in a populated region rather than in unpopulated regions in Central America as a whole. In some northwestern Iowa and southwestern Minnesota counties, the outdoor radon concentrations exceed the national average indoor radon concentrations. Despite the above average, both Minnesota and Iowa's numbers were exceptionally close, regardless of the distance. Accurate doses of Radon is heavily needed to further understand the problems Radon in total can have on a community. It is understood that radon poisoning does lead to bad health, and lung cancer, but with further research, controls could change results in radon emissions both inside and outside of housing units.