The Agency for Toxic Substances Disease Registry Toxicological Profile succinctly characterizes the toxicological and adverse health effects information for radon. The focus of this profile is on health and toxicological information and therefore begins with a Public Health Statement that summarizes in non-technical language, radon's relevant properties. Topics include human health, chemical and physical information, production, import, use and disposal, potential for human exposure, analytical methods, and regulations and advisories.