The Environmental Protection Agency was the governmental agency responsible for managing and overseeing radon programs in the U.S. from the earliest days of the program until 1999.

 Not only did they co-ordinate training for radon professionals, they also developed codes and protocols for radon testing and radon contractors.

The EPA has also developed and dispersed most of the information that exists about radon soil gas, and the health risks associated with it. We have listed below some of the many web sites provided by the EPA

• US EPA's Citizen's Guide to Radon
• US EPA's Home Buyer's and Seller's Guide
• US EPA's Consumer's Guide to Radon Reduction
• National Academy of Science BEIR VI Report on Radon in Indoor Air
• US EPA's Index of Available Publications

In addition you should check out the EPA's radon pageand the whole list of subject involving Indoor Air Quality.