RadNet is a national network of monitoring stations that regularly collect air for analysis of radioactivity. The RadNet network, which has stations in each State, has been used to track environmental releases of radioactivity from nuclear weapons tests and nuclear accidents. RadNet also documents the status and trends of environmental radioactivity
Scott Telofski, U.S. EPA Office of Air and Radiation (OAR) - Office of Radiation and Indoor Air (ORIA)