1. Center
for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
2. Engineering
and Public Policy, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
3. Mobile Source
Operations,
California Air Resources Board, El Monte, California 91731, United States
4. Monitoring and
Laboratory, California Air Resources Board, El
Monte, California 91731, United States
5. Planning and Technical
Support, California Air Resources Board, El Monte, California 91731, United States
6. Research Division, California
Air Resources Board, Sacramento, California 95814, United States
7. Research and Advanced
Engineering, Ford Motor Company, Dearborn, Michigan 48120, United States