Abstract

CAEIRO, Elsa et al. Analysis of airborne grass pollen concentrations in theatmosphere of mainland Portugal. Rev Port Imunoalergologia [online]. 2014, vol.22, n.2, pp.125-138. ISSN 0871-9721.

Background: Airborne grass pollen constitutes the main cause of pollinosis in Portugal. Objectives: To analyze and to compare the main atmospheric pollen season (MAPS) of grass pollen in different monitoring stations of the Portuguese Aerobiology Network: Oporto, Coimbra, Lisbon, Évora and Portimão. Methods: In this study, daily sampling data of Poaceae pollen from five monitoring stations over the last seven years (2002 -2008) were used. Results: Statistical significant differences were observed in pollen indices and in main pollen atmospheric seasons: length and ending date. The highest concentrations of grass pollen were recorded from May to July. The beginning of the MAPS was earlier at the monitoring stations near the coast, Lisbon and Oporto, and it was recorded later in the south part of the country, in Évora. The absolute daily maximum concentrations were recorded in June and July in Oporto, at the end of May and beginning of June in Coimbra, on May in Lisbon, Évora and Portimão. The length of MAPS decreased from north to south. The end of MAPS was in August in the north and in July in the south. Although the observed interannual differences, Oporto and Coimbra showed the lowest pollen index, 2.151 and 1.617 pollen/year respectively, while Évora recorded the highest pollen index, 16.736 pollen/year. Concentrations >25 pollen/m3 were recorded in Oporto during 23 ± 5 days, in Coimbra during 16 ± 8 days, in Lisbon 34 ± 15 days, in Évora during 54 ± 9 days and in Portimão during 39 ± 12 days. Conclusions: Between the stations there were differences in MAPS of grasses. In Portugal, the risk of exposure to this pollen type is higher in the southern inland and rural areas.

Keywords : Aerobiology; grasses; main atmospheric pollen season; Poaceae; pollen season; Portugal.

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