1999 Assessment Results
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
1999 Emissions: Maps and data tables that present 1999 emissions and emission density information across the United States plus Puerto Rico and the Virgin Islands.
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1999 Modeled Ambient Concentrations: Maps and data tables of EPA's 1999 ambient concentration estimates across the United States plus Puerto Rico and the Virgin Islands using an air dispersion model (ASPEN model ) and 1999 national air toxics emissions as input to the model.
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1999 Modeled Human Exposure:Provides information about EPA's 1999 population exposure estimates across the United States plus Puerto Rico and the Virgin Islands using an inhalation exposure model (HAPEM5) and the estimated ambient concentrations (i.e., ASPEN model results) as input to the model. Exposure modeling is an important step in this assessment because it factors in that people move around from one location to another, outside to inside, etc.
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1999 Estimated Risk: Provides information about the 1999 estimates of public health risks due to inhalation of air toxics, including both cancer and noncancer health effects. The estimates rely on current EPA risk assessment and risk characterization guidelines and the estimated population exposures (HAPEM5 model results).
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