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Susan L. Cutter, PhD, Michael S. Scott, PhD and Arleen A. Hill, MS

Susan L. Cutter is with the Department of Geography, University of South Carolina, Columbia. Michael S. Scott is with the Department of Geography, Salisbury University, Salisbury, Md. Arleen A. Hill is a PhD student in the Department of Geography, University of South Carolina, Columbia.

Correspondence: Requests for reprints should be sent to Susan L. Cutter, PhD, Department of Geography, University of South Carolina, Columbia, SC 29208 (e-mail: scutter{at}sc.edu).

Objectives. This study used 6 different measures of toxicity to explore spatial and statistical variations in relative risk indicators of Toxic Release Inventory emissions.

Methods. Statistical and spatial correlations between the 6 indices were computed for individual South Carolina facilities.

Results. Although the 6 toxicity indices are not highly correlated in theory, they have more commonality in practice. There was significant spatial variation in the indices by individual facility level.

Conclusions. Environmental justice researchers must be cognizant of differences in toxicity indices because the choice of the toxicity measure can alter (statistically and spatially) the results of equity analyses and lead to erroneous conclusions. (Am J Public Health. 2002;92:420-422)

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