LIST OF FIGURES

Figure

1. Example relationships among mobile source PM, its precursors, and other air quality issues, modified from Carr et al., 2002a.

2. Process used to determine transportation community research priorities for this Strategic Plan.

3. Relationship among broad research topic areas and transportation policy issues. Broad research categories are colored by research topic area (the color scheme is consistent with Table 4 and Figure C-1). Air quality agency tasks are shown in green, and transportation agency tasks are shown in gray. Applied research topics are more likely to be funded by FHWA.

4. Mobile particle instrumentation unit from the UCLA-based Southern California Particle Center Supersite. Photo courtesy of the Southern California Particle Center Supersite.

5. Predicted downwind pollutant concentrations as a function of wind speed and distance from the roadway from the EPA's CAL3QHC model, not including background concentrations. Reprinted from Tamura and Eisinger (2003).

6. Attenuation of PM₁₀ and PM_2.5 mass concentrations with time and vertical mixing volume. (Reprinted from Countess et al., 2001 with permission.)

7. PM emissions as a function of speed from the MOBILE6.2 emissions model. Figure reprinted with permission from Granell et al., (2004).

8. Collage of control measure situations. High occupancy vehicle lanes in Denver (left-courtesy of The Regional Transit District-Denver, CO), bike lane in San Francisco (center-stock photo courtesy of San Francisco Metropolitan Transportation Commission), and fugitive dust in Nevada (right-photo courtesy of Business Environmental Program of Nevada).