The health risks associated with high levels of radon gas exposure are well-documented by the Surgeon General of the United States, the EPA, the World Health Organization (WHO), and the Nebraska Department of Health & Human Services. Radon is known to be the #2 cause of lung cancer in the United States, and the #1 cause for non-smokers. Radon poisoning and regular exposure does not cause common symptoms like headaches, nausea, or vomiting that are regularly attributed to other pollutants.
The Environmental Protection Agency classified radon as a human carcinogen in 1988.
The U.S. office of the Surgeon General recommends that all houses be tested for radon. Typically most houses are tested for radon at the time of sale, but radon should be tested periodically, as levels can change over time depending on changing outdoor conditions, and usage habits of below-grade indoor space.
While any exposure to radon can be considered potentially damaging, the EPA recommends that homeowners aim for radon levels below 2 picocuries per liter (2pCi/L).
According to the Nebraska Department of Health & Human Services there is a high prevalence of radon in homes. 1 out of every 2 tests done in the state show elevated levels.
There are government resources to help you further understand the health effects and what you can do to prevent dangerous radon exposure.