Microenvironmental and biological/personal monitoring information were collected during the National Human Exposure Assessment Survey (NHEXAS), conducted in the six states comprising U.S. EPA Region Five. They have been analyzed by multivariate analysis techniques with general household characteristics and activities that influence levels of residential exposure to contaminants. The aims of these analyses were to identify specific suites of characteristics and/or activities that indicate the presence of significant levels of multiple environmental contaminants in residences. Included were cadmium, chromium, arsenic, lead, inspirable particulate mass, 1,1,1-trichloroethylene, p-dichlorobenzene, benzene, chloroform, styrene, tetrachloroethylene, toluene, trichloroethylene, m,p-xylene, and o-xylene, and many were measured in multiple media. Residential characteristics and activities were collected using multiple survey instruments. A suite of factor analysis results for level of environmental contamination i...