a B.S. in economics, and a B.Met. from the University of Calcutta, India, and Sc.M and Ph.D from Brown University.

George M. Hidy is Alabama Industries Professor of Environmental Engineering at the University of Alabama, where he is also professor of environmental health science in the School of Public Health. From 1987 to 1994, he was technical vice president of the Electric Power Research Institute (EPRI), where he managed the Environmental Division and was a member of the Management Council. From 1984 to 1987, he was president of the Desert Research Institute of the University of Nevada. He has held a variety of other scientific positions in universities and industry and has made significant contributions to research on the environmental impacts of energy use, including atmospheric diffusion and mass transfer, aerosol dynamics, and chemistry. He is the author of many articles and books on these and related topics. Dr. Hidy received a B.S. in chemistry and chemical engineering from Columbia University; an M.S.E. in chemical engineering from Princeton University; and a D.Eng. in chemical engineering from The Johns Hopkins University.

Rudolf B. Husar is director of the Center for Air Pollution Impact and Trend Analysis at Washington University, a position he has held since 1979. He is also a professor of mechanical engineering. His research centers on developing and applying methods for using information to address environmental problems. His contributions include improvements in the production, processing, and flow of environmental information; new techniques for modeling air pollutant emissions, concentrations, and trends; and techniques for satellite detection of atmospheric aerosols. He has published widely on all of these topics. Professor Husar's national and international advisory activities include leading World Meteorological Organization panels on aerosol measurement; serving on NRC committees on various aspects of atmospheric pollution; and serving on EPA panels on the formation and transport of ozone and particulate matter. Dr. Husar studied mechanical engineering at the University of Zagreb, Croatia, and received an engineering diploma in mechanical engineering from the Technical University in Berlin, FRG, and a Ph.D. in mechanical engineering from the University of Minnesota, followed by a post-doctoral fellowship at the California Institute of Technology.

Frederick W. Lipfert is an environmental consultant. He previously held research and management positions at Brookhaven National Laboratory involving national energy planning with an emphasis on environmental impacts, was manager of air quality at an electric utility company, and worked in the aerospace industry. He has done research and published extensively on the effects of air pollution, the characteristics of source emissions, air pollutant dispersion and modeling, and air quality characterization. His recent work has focused on the health impacts of air pollution. He has a B.S. in mechanical engineering and an M.S. in aeronautical engineering from the University of Cincinnati and a Ph.D. in environmental studies from the Union Institute.

John Longwell (NAE) is currently Professor Emeritus, Department of Chemical Engineering, at the Massachusetts Institute of Technology (MIT). He spent 33 years with Exxon Research and Engineering Company, where he was engaged in research and research management activities on petroleum, petrochemistry, and propulsion. He has extensive experience in the utilization of fossil energy resources and in fuels and combustion systems. He has served as chairman and member of a number of NRC committees and was recently a member of the NRC Committee on the Ozone-Forming Potential of Reformulated Gasoline. He has a B.S. in mechanical engineering from the University of California, Berkeley, and an Sc.D. in chemical engineering from MIT.

Spyros N. Pandis is associate professor of chemical engineering at Carnegie Mellon University, where he has been on the faculty since 1993. He is a well known expert on the atmospheric chemistry of aerosols, photochemical smog, and acid deposition. He is coauthor, with John Seinfeld, of Atmospheric Chemistry and Physics: From Air Pollution to Climate Change (John Wiley and Sons, 1997). He also publishes widely in peer-reviewed journals. Professor Pandis received an engineering diploma from the University of Patras, Greece, and M.S. and Ph.D. degrees in chemical engineering from the California Institute of Technology.

George T. Wolff is principal scientist at the General Motors Public Policy Center and adjunct professor of civil and environmental engineering at Michigan State University and an adjunct professor in the University

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