Wayne P. Robarge, Ph.D., is a professor of soil physical chemistry in the Department of Soil Science at North Carolina State University. His research interests include studies of emissions of ammonia from swine lagoons, temporal and spatial patterns in ambient ammonia and ammonium aerosol concentrations, nitrogen budgets using Geographical Information Systems, and dry deposition of ammonia and ammonium aerosols to crop and woodland canopies. He received his B.S. (1969) and M.S. (1971) from Cornell University and his Ph.D. (1975) in soil science from the University of Wisconsin-Madison. He currently serves on the USDA Task Force on Agricultural Air Quality. He currently conducts research from the North Carolina State University Animal and Poultry Waste Management Center as part of “An Integrated Study of the Emissions of Ammonia, Odor and Odorants, Pathogens and Related Contaminants from Potential Environmentally Superior Technologies for Swine Facilities”.

Daniel A. Wubah, Ph.D., is a professor of biology and associate dean of the College of Science and Mathematics at James Madison University. Prior to this, Wubah was chairperson of the Department of Biology at Towson University. His special expertise includes rumen microbiology and anaerobic zoosporic fungi. He received his B.S. and B.Ed. (1984) from the University of Cape Coast (Ghana), M.S. (1987) from the University of Akron, and Ph.D. from the University of Georgia (1990). Wubah previously served on the National Research Council Panel for Review of Proposals Under the AID (Agency for International Development) Research Grants Program for the Historically Black Colleges and Universities—Agriculture, Health, and Social Sciences. He is a member of the Board of Governors of the National Aquarium in Baltimore.

Kelly D. Zering, Ph.D., is an associate professor in the Department of Agricultural and Resource Economics at North Carolina State University. His special expertise is the economics of swine production and processing. He received his B.S. (1977) and M.S. (1980) from the University of Manitoba and his Ph.D. (1984) in agricultural economics from the University of California, Davis. Dr. Zering has extension responsibilities in the areas of swine management and marketing. He has completed research funded by EPA and the Animal and Poultry Waste Management Center, titled “Economic Analysis of Alternative Manure Management Systems.” He currently conducts research on manure technology evaluation funded by the North Carolina Attorney General-Smithfield Agreement via the Animal and Poultry Waste Management Center.

Ruihong Zhang, Ph.D., is an associate professor in the Department of Biological and Agricultural Engineering at the University of California, Davis. Her main interests include control of gaseous and particulate emissions from animal feedlots, and wastewater treatment. She is a member of the USDA multistate research project NCR-189, “Air Quality Issues Associated with Livestock Facilities” and



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