Two EPA approaches to radon surveys

In an attempt to characterize radon distribution in residential settings, the USEPA initiated two distinct survey programs, the National Residential Radon Survey (NRRS) and the State/EPA Residential Radon Survey (SRRS). Each survey is different in their level of analysis, with the NRRS concentrating on a national sample, and the SRRS concentrating on individual statewide samples. Both surveys are random and statistically-valid, enabling the survey samples to be extrapolated to represent a much larger population. This paper details each survey's design and provides an examination of the unique approach each program uses to generate sound characterizations of radon distribution in the United States.