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EPA’s Human Exposure and Atmospheric Sciences program conducts research in support of EPA’s mission to protect human health and the environment.  EPA’s integrated, multi-disciplinary research programs produce high-quality methods, measurements, and models needed to enable a sound scientific understanding of the processes and factors that impact relationships between sources of environmental pollutants, environmental concentrations, and human exposure.

Human Exposure and Atomospheric Sciences Research

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Identifying Air Pollution Sources of Greatest Risk

EPA is developing and applying source apportionment and exposure assessment tools to identify the air pollution sources contributing to the most significant human health risks.

Understanding Risks to Susceptible Subpopulations
EPA’s research program is seeking to identify and understand the factors that influence children’s exposures and exposures to elderly Americans.

Aggregate and Cumulative Risk
The goal of this EPA research program is to improve our understanding of aggregate exposures (exposure to a single pollutant via multiple pathways) and cumulative exposures (aggregate exposure from multiple pollutants).

Regulatory Support Applications
EPA is conducting research in support of its regulations and policies.


Research projects in the process of collecting data.

Research projects that have completed testing and data analysis.

The products (e.g., models, databases) that were created from research projects.

Human Exposure and Atmospheric Sciences Publications Citations for 1999 - present Citations with abstracts: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009

Human Exposure and Atmospheric Sciences

Research & Development | National Exposure Research Laboratory


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