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Analysis of Air Toxics Emissions, Exposures, Cancer Risks and Controllability in Five Urban Areas

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The purpose of this study was to define the multi-source, multi-pollutant nature of the urban air toxics problem and to discern what control measures or combination of measures can best be used to mitigate the urban air toxics problem. This study was built on a controllability study for the same five cities which was done in 1985. The results of that study were not formally published, but were used to help formulate EPA's National Air Toxics Strategy.

The first phase of this project was to take the latest available emissions and source data and compile them, and use them as input to EPA's Human Exposure Model (HEM). This model was used to estimate ambient air concentrations and population exposures to 25 carcinogens. From this modeling analysis, estimates were made of the sources and pollutants contributing to additive cancer risk throughout each urban area. Population risk was also estimated. The second phase of the project was the population analysis, and included an evaluation of the mitigation potential of various control measures. The results of the second phase are not presented in this document.

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