National Radon Proficiency Program

National Safety Council Radon Information Page http /Avww.nsc.org/ehW radon.htm NEHA—National Radon Proficiency Program http //www.radongas.oig/... 

Letter from Mary T. Smith, Director Indoor Environments Division, Office of Air and Radiation, EPA, Mr. Larry L. Marcum, J.D., MJtA., Manager, Research and Development, Radon Program Manager, National Environmental Health Association, National Radon Proficiency Program (Mar. 30,2001) (on file with the EPA) and Letter from Mary T. Smith, Director Indoor Environments Division, Office of Air and Radiation, EPA to Ms. Nancy Bredhoff, President, National Radon Safety Board (Mar. 30,2001) (on file with the EPA). 

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