Abstract
In the southern hemisphere, the airborne prevalence and seasonal distribution of Asteraceae pollen are poorly characterized. In this study, we assessed the longitudinal distribution of Asteraceae pollen using an historic aerobiological dataset. The influence of weather parameters on pollen derived from Asteraceae species was additionally explored. Asteraceae pollen was collected using a static Burkard 7-day spore trap during a 5-year (June 1994–May 1999) aerometric surveillance program in Brisbane, Australia. Two discrete seasonal intervals were identified each sampling year. The first interval (September and October) consisted of small quantities of unidentifiable Asteraceae pollen. The second interval (March and April) was characterized by the highest concentrations of Asteraceae pollen that were predominantly derived from Baccharis halimifolia. Associations between daily Asteraceae pollen concentrations and temperature were observed during each sampling year. The results of the study demonstrated that pollen derived from B. halimifolia, an invasive weed species introduced in the late nineteenth century, continue to be in the environment of Brisbane. Given the public health burden associated with personal Asteraceae pollen exposure in other geographic locations, future Australian-based clinical studies should characterize the contribution of Asteraceae pollen, in particular B. halimifolia, to allergic sensitization and respiratory morbidity.



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Acknowledgments
This research was made possible by financial support from the Asthma Foundation of Queensland. Special thanks to Dr. Shannon Rutherford, and the staff of the School of Public Health, Griffith University, for their technical assistance, as well as the Department of Environment and the Bureau of Meteorology for providing the meteorological data. The findings and conclusions in this report are those of the author(s) and do not necessarily represent the views of the National Institute for Occupational Safety and Health.
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Green, B.J., Simpson, R.W. & Dettmann, M.E. Assessment of airborne Asteraceae pollen in Brisbane, Australia. Aerobiologia 28, 295–301 (2012). https://doi.org/10.1007/s10453-011-9224-0
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DOI: https://doi.org/10.1007/s10453-011-9224-0