determining whether there are particular component species (e.g. sulfates, nitrates, and elemental
15or organic carbons) that dominate the makeup of high, low, and average PM2.5 concentrations
16will help guide the degree of analysis and ultimately justification that will be required in the
17qualitative assessment based on the magnitude and characteristics of any significant precursor
18emissions from the source. It may also be important to describe the typical background
19concentrations of certain chemical species that participate in the photochemical reactions that
20form secondary PM2.5, such as NH3, VOC, and ozone. It is possible that there are mitigating
13For more detailed information on the development of such conceptual descriptions for an area, please refer to the
following: Chapter 10 of “Particulate Matter Assessment for Policy Makers: A NARSTO Assessment.” P.
McMurry, M. Shepherd, and J. Vickery, eds. Cambridge University Press, Cambridge, England (NARSTO, 2004).
Section 11, “How Do I Get Started? 'A Conceptual Description'” of “Guidance on the Use of Models and Other
Analyses for Demonstrating Attainment of Air Quality Goals for Ozone, PM2.5, and Regional Haze.” U.S.
Environmental Protection Agency, Research Triangle Park, North Carolina (U.S. EPA, 2007a)
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