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Connecting the Dots: Linking Environmental Justice Indicators to Daily Dose Model Estimates

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  • Hongtai Huang

    (Oak Ridge Institute for Science and Education (ORISE) at U.S. Environmental Protection Agency, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC 27711, USA
    U.S. Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, 109 T.W. Alexander Drive, Research Triangle Park, NC 27711, USA)

  • Timothy M. Barzyk

    (U.S. Environmental Protection Agency, National Exposure Research Laboratory, Research Triangle Park, 109 T.W. Alexander Drive, Research Triangle Park, NC 27711, USA)

Abstract

Many different quantitative techniques have been developed to either assess Environmental Justice (EJ) issues or estimate exposure and dose for risk assessment. However, very few approaches have been applied to link EJ factors to exposure dose estimate and identify potential impacts of EJ factors on dose-related variables. The purpose of this study is to identify quantitative approaches that incorporate conventional risk assessment (RA) dose modeling and cumulative risk assessment (CRA) considerations of disproportionate environmental exposure. We apply the Average Daily Dose (ADD) model, which has been commonly used in RA, to better understand impacts of EJ indicators upon exposure dose estimates and dose-related variables, termed the Environmental-Justice-Average-Daily-Dose (EJ-ADD) approach. On the U.S. nationwide census tract-level, we defined and quantified two EJ indicators (poverty and race/ethnicity) using an EJ scoring method to examine their relation to census tract-level multi-chemical exposure dose estimates. Pollutant doses for each tract were calculated using the ADD model, and EJ scores were assigned to each tract based on poverty- or race-related population percentages. Single- and multiple-chemical ADD values were matched to the tract-level EJ scores to analyze disproportionate dose relationships and contributing EJ factors. We found that when both EJ indicators were examined simultaneously, ADD for all pollutants generally increased with larger EJ scores. To demonstrate the utility of using EJ-ADD on the local scale, we approximated ADD levels of lead via soil/dust ingestion for simulated communities with different EJ-related scenarios. The local-level simulation indicates a substantial difference in exposure-dose levels between wealthy and EJ communities. The application of the EJ-ADD approach can link EJ factors to exposure dose estimate and identify potential EJ impacts on dose-related variables.

Suggested Citation

  • Hongtai Huang & Timothy M. Barzyk, 2016. "Connecting the Dots: Linking Environmental Justice Indicators to Daily Dose Model Estimates," IJERPH, MDPI, vol. 14(1), pages 1-15, December.
    • Handle: RePEc:gam:jijerp:v:14:y:2016:i:1:p:24-:d:86422
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    1. James E. S. Nolan & Eric S. Coker & Bailey R. Ward & Yahna A. Williamson & Kim G. Harley, 2021. "“Freedom to Breathe”: Youth Participatory Action Research (YPAR) to Investigate Air Pollution Inequities in Richmond, CA," IJERPH, MDPI, vol. 18(2), pages 1-18, January.
    2. Shauntice Allen & Michelle V. Fanucchi & Lisa C. McCormick & Kristina M. Zierold, 2019. "The Search for Environmental Justice: The Story of North Birmingham," IJERPH, MDPI, vol. 16(12), pages 1-13, June.

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