1. a U.S. Environmental Protection Agency, Office of Research and Development , National Risk Management Research Laboratory , Research Triangle Park , NC , USA
2. b Office of Air and Radiation, Office of Transportation and Air Quality , National Vehicle and Fuel Emissions Laboratory , Ann Arbor , MI , USA
3. c National Oceanic and Atmospheric Administration , Atmospheric Sciences Modeling Division , Research Triangle Park , NC , USA
4. d ARCADIS Inc. , Research Triangle Park , NC , USA
5. e Department of Civil and Environmental Engineering, Pratt School of Engineering , Duke University , Durham , NC , USA
6. f U.S. Environmental Protection Agency, Office of Research and Development , National Exposure Research Laboratory , Research Triangle Park , NC , USA
7. g U.S. Environmental Protection Agency, Office of Research and Development , National Health and Environmental Effects Research Laboratory , Research Triangle Park , NC , USA
8. h U.S. Environmental Protection Agency, Office of Air and Radiation , Research Triangle Park , NC , USA
9. i North Carolina Central University , Durham , NC , USA