economic instruments for environmental protection. She was deputy director of the Environmental Protection Agency’s Office of Atmospheric Programs. Dr. Kete received a B.S. in geography from Southern Illinois University and a Ph.D. in geography and environmental engineering from the Johns Hopkins University.

Charles E.Kolb is president of Aerodyne Research Inc. His research involves experimental and theoretical studies of the chemistry and physics of trace atmospheric species, chemical kinetics, and combustion chemistry and spectroscopy. Dr. Kolb has served on numerous National Research Council bodies, including the Committee to Assess the North American Research Strategy for Tropospheric Ozone Program, the Committee on Tropospheric Ozone Formation and Measurement, the Committee on Atmospheric Chemistry, and the Board on Atmospheric Sciences and Climate. He received a B.S. in chemistry from the Massachusetts Institute of Technology and an M.S. and a Ph.D. in physical chemistry from Princeton University.

William Leiss is a professor in the School of Policy Studies at Queen’s University (Kingston, Ontario) and research chair in risk communication and public policy in the Faculty of Mangement, University of Calgary (Alberta). His research interests include risk communication, risk management, and public policy. Dr. Leiss was president of the Royal Society of Canada in 1999–2001. He received a B.A. in history from Fairleigh Dickinson University, an M.A. in history from Brandeis University, and a Ph.D. in philosophy from the University of California, San Diego, and he has held university appointments in political science, environmental studies, sociology, and communication.

Gerardo Manuel Mejía-Velazquez is professor of environmental and chemical engineering at the Center for Environmental Quality of the Instituto Tecnológico y de Estudios Superiores de Monterrey (ITESM) in Mexico. His research interests include environmental modeling and optimization and parameter estimation. He has worked on joint international research projects related to air-quality modeling and education and is on the advisory board of the Mexican Research and Development Network on Air Quality in Large Cities. He is a member of the Geosciences Commitee of El Consejo Nacional de Ciencia y Tecnología (CONACYT) and of the Technnical Advisory Committee for the National Emission Inventory in Mexico and a board member of the Advanced Technology Environmental Education Center. Dr. Mejía-Velazquez received a B.S. in chemical engineering from Universidad Autónoma de San Luis Potosí, an M.E. in chemical engineering from ITESM, and a Ph.D. in chemical engineering from Texas A&M University.

Luisa T.Molina is an atmospheric chemist in the Department of Earth, Atmospheric and Planetary Sciences of the Massachusetts Institute of Technology and the executive director of the Integrated Program on Urban, Regional, and Global Air Pollution. The central element of the program is an integrated assessment of air pollution in Mexico City. Her research interests include molecular spectroscopy, chemical kinetics, and atmospheric chemistry. She has been involved in particular with the chemistry of stratospheric ozone depletion and urban air pollution. Dr. Molina is a member of the Mexican Research and Development Network on Air Quality in

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