Federal Highway Administration
Office of Natural and Human Environment
San Francisco, CA 94111
Special thanks go to Ana Alvarez for performing hundreds of MOBILE6, MOBILE5 and MOBILE4.1 simulations. Credit is due to Seth Hartley for the multiple CAL3QHC and CALINE3 model simulations. David Pierce was invaluable in assisting in the telephone and e-mail interviews. Thanks are also due to Paul Heishman of PH/PE, Incorporated for his cooperation and technical assistance in the practical aspects of project-level air quality modeling and in screening procedure development.