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Comparative study of the effect of distance on the daily and hourly pollen counts in a city in the south-western Iberian Peninsula

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Abstract

The airborne pollen concentration in the city of Badajoz was measured in two locations 2.9 km apart. The measurements were taken from January to June between 2009 and 2012 using Hirst-type volumetric aerobiological samplers. One sampler was placed at the Faculty of Science (FS) and the other at the Agricultural Engineering School (AES) of the University of Extremadura, Spain, on terraces located 16 and 6 m above ground, respectively. The two sets of hourly and daily pollen concentrations were compared regarding the meteorological parameters and the distribution of local pollen sources. A total of 46 pollen types were counted, with a mean total concentration of 43 pollen grains/m³ in the winter and 336 pollen grains/m³ in the spring. In the winter, pollen grains from (in decreasing order) Cupressaceae, Fraxinus–Phillyrea, Urticaceae spp., Alnus glutinosa and Urtica membranacea types represented 77 % of the total. In the spring, 89 % of the total was represented by pollen grains from (in decreasing order) Quercus, Poaceae, Olea, Pinaceae and Plantago. The FS/AES ratio was 0.57 in the winter and 1.31 in the spring. While a Wilcoxon test applied to the daily total concentration data showed statistically significant differences between the two sites, a correlation study based on the Spearman coefficient showed statistically significant correlations in both the winter and spring. The results were similar when comparing the separate pollen types, except for Urticaceae spp., which showed no statistically significant correlation. The meteorological data studied showed a statistically significant correlation with the daily concentrations. A comparison of the hourly concentration data showed no correspondence with the time of maximum concentration. The local distribution of pollen sources explained some of the differences found between the two sites. Overall, the results indicate that a single aerobiological sampler may be sufficiently representative to register the daily pollen grain data of an urban area of approximately 3 km or greater in diameter, although it underestimates the influence of heterogeneity in the distribution of the local flora.

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Acknowledgments

This work was made possible by the research projects PRI06A190 and PRI BS10008 financed by the Regional Government, Junta de Extremadura (Spain) and the European Social Fund.

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Authors and Affiliations

  1. Department of Plant Biology, Ecology and Earth Sciences, Faculty of Science, University of Extremadura, Avda. Elvas s/n, 06071, Badajoz, Spain

    Santiago Fernández-Rodríguez, Rafael Tormo-Molina & José María Maya-Manzano

  2. Department of Applied Physics, Engineering Agricultural School, University of Extremadura, Badajoz, Spain

    Inmaculada Silva-Palacios

  3. Department of Allergology, Hospital Universtario Infanta Cristina, Badajoz, Spain

    Ángela Gonzalo-Garijo

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  1. Santiago Fernández-Rodríguez
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  2. Rafael Tormo-Molina
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  3. José María Maya-Manzano
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  4. Inmaculada Silva-Palacios
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  5. Ángela Gonzalo-Garijo
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Correspondence to Santiago Fernández-Rodríguez.

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Fernández-Rodríguez, S., Tormo-Molina, R., Maya-Manzano, J.M. et al. Comparative study of the effect of distance on the daily and hourly pollen counts in a city in the south-western Iberian Peninsula. Aerobiologia 30, 173–187 (2014). https://doi.org/10.1007/s10453-013-9316-0

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