1. U.S. Environmental Protection Agency. Technical Background Document to Support Rulemaking Pursuant to Clean Air Act Section 112(g): Ranking of Pollutants with Respect to Human Health; Research Triangle Park, NC, 1994.
2. Rosenbaum, A.S.; Ligocki, M.P., Wei, Y.H. Modeling Cumulative Outdoor Concentrations of Hazardous Air Pollutants; Prepared for U.S. Environmental Protection Agency, Office of Policy, Planning, and Evaluation by Systems Applications International, 1999; SYSAPP-99-96/33R2.
3. Robinson, J.; Thomas, J. Time Spent in Activities, Locations, and Mi-croenvironments: A California-National Comparison; U.S. Environmental Protection Agency, 1991; EPA/600/4-91/006.
4. Johnson, T. A Study of Human Activity Patterns in Cincinnati; PEI Associates: Durham, NC, 1987.
5. Wiley, J.; Robinson, J.; Piazza, T.; Garrett, K.; Cirkensa, K.; Cheng, Y.; Martin, G. Activity Patterns of California Residents; California Air Resources Board, 1991.