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    Establishing Policy Relevant Background (PRB) Ozone Concentrations in the United States
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    † University of Texas at Austin, Austin Texas
    ‡ Lawrence Berkeley National Laboratory, Berkeley, California
    § Harvard University, Cambridge, Massachusetts
    ∥ University of Washington, Bothell, Washington
    ⊥ Aerodyne Research, Inc., Billerica, Massachusetts
    # ASL & Associates, Helena, Montana
    ▽ National Oceanic and Atmospheric Administration, Boulder, Colorado
    ○ ENVIRON International, Novato, California
    Phone: (512) 471-0049; fax: (512) 471-1720; e-mail: [email protected]
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    Environmental Science & Technology

    Cite this: Environ. Sci. Technol. 2011, 45, 22, 9484–9497
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    https://doi.org/10.1021/es2022818
    Published October 10, 2011
    Copyright © 2011 American Chemical Society
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    Abstract

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    Policy Relevant Background (PRB) ozone concentrations are defined by the United States (U.S.) Environmental Protection Agency (EPA) as those concentrations that would occur in the U.S. in the absence of anthropogenic emissions in continental North America (i.e., the U.S, Canada, and Mexico). Estimates of PRB ozone have had an important role historically in the EPA’s human health and welfare risk analyses used in establishing National Ambient Air Quality Standards (NAAQS). The margin of safety for the protection of public health in the ozone rulemaking process has been established from human health risks calculated based on PRB ozone estimates. Sensitivity analyses conducted by the EPA have illustrated that changing estimates of PRB ozone concentrations have a progressively greater impact on estimates of mortality risk as more stringent standards are considered. As defined by the EPA, PRB ozone is a model construct, but it is informed by measurements at relatively remote monitoring sites (RRMS). This review examines the current understanding of PRB ozone, based on both model predictions and measurements at RRMS, and provides recommendations for improving the definition and determination of PRB ozone.

    Copyright © 2011 American Chemical Society

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    Cite this: Environ. Sci. Technol. 2011, 45, 22, 9484–9497
    Click to copy citationCitation copied!
    https://doi.org/10.1021/es2022818
    Published October 10, 2011
    Copyright © 2011 American Chemical Society
    Request reuse permissions

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