models for acid deposition and global climate change. Dr. Small has served on EPA's Office of Research and Development's Board of Scientific Counselors and is currently a member of EPA's Science Advisory Board. He has served on several NRC committees, including the Committee on Remediation Priorities for Hazardous Waste Sites and the Committee on Environmental Remediation at Naval Facilities. Dr. Small is an associate editor for the journal Environmental Science & Technology.

Ira B. Tager is professor of epidemiology in the Division of Public Health, Biology, and Epidemiology at the University of California, Berkeley, and is codirector and principal investigator for the Center for Family and Community Health. He holds an M.D. from the University of Rochester School of Medicine and an M.P.H from the Harvard School of Public Health. Dr. Tager's research interests include the development of exposure assessment instruments for studies of health effects of chronic ambient ozone exposure in childhood and adolescence, the effects of ozone exposure on pulmonary function, and the effects of oxidant and particulate air pollution on cardiorespiratory morbidity and mortality as well as morbidity from asthma in children. Dr. Tager was a member of the NRC Committee on Air Quality in Passenger Cabins of Commercial Aircraft. He currently serves as a member of the Research Committee for the Health Effects Institute.

John G. Watson is a research professor in the Division of Atmospheric Sciences at the Desert Research Institute in Reno, Nevada. His research includes the development and evaluation of measurement processes, receptor models for source apportionment, and the effects of measurement uncertainty on model results. Dr. Watson is the primary author of a chemical mass balance receptor model and its application and validation protocol. Dr. Watson is currently principal investigator for the California regional particulate and air quality study, the Fresno Supersite, the southern Nevada air quality study, and for a Department of Defense program to quantify emissions from nonroad diesel engines. He recently completed the 2002 Air and Waste Management Association's critical review of Visibility: Science and Regulation that examined evolution and scientific justification for EPA's Regional Haze Rule. He earned a Ph.D. in environmental science from the Oregon Graduate Institute.

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