Aerobiology is the study of airborne particles that have an impact on humans and other organisms. Every day, we are exposed to airborne particles, including natural particles such as pollen, bacteria, and fungi, and unnatural particles, such as asbestos fibers and noxious chemicals. Aerobiology highlights the current interests in this field, primarily the ecology and distribution of airborne particles and their effects on health.Introduction, M. Muilenberg and H. Burge Microbial Emissions from Composts and Associated Risks - Trials and Tribulations of an Occupational Aerobiologist (Keynote Address), J. Lacey, P. Williamson, and B. Crook Ecology/Distribution Phenology and Aerobiology of Ragweed Pollen, P. Comtois and S. Boucher The Influence of Wind Speed on the Ambient Concentrations of Pollen from Gramineae, Platanus and Betula in the Air of London, England, J. Emberlin and J. Norris-Hill Aeropollen of Mimosoideae, I. Hurtado and J. Alson Pathogenic Spore-Fungi in School Dust in the South of Spain, J. Angulo, F. Infante, E. Dominquez, A. Mediavilla, and J. Caridad Prevalence of House Dust Mites from Homes in the Sonoran Desert, Arizona, M.K. O'Rourke, C. Moore, and L. Arlian Aeromicrobial Analyses in a Wastewater Treatment Plant, J. Lavoie, S. Pineau, and G. Marchand Airborne Microorganisms in a Domestic Waste Transfer Station, I. Rosas, C. Calder?n, E. Salinas, and J. Lacey Health Effects Legionella in Cooling Towers: Use of Legionella-Total Bacteria Ratios, R. Miller and K. Kenepp Conifer Pollen: Is a Reassessment in Order? M. Pettyjohn and E. Levetin Comparison of Allergenic Potency of Four Batches of Cladosporium herbarum, H. Vijay, M. Burton, G. Muradia, N. Young, and M. Corlett The Detection of Airborne Allergens Implicated in Occupational Asthma, J. Lacey, B. Crook, and A. Janaki Bai Index