Effect of the meteorological parameters on the Olea europaea L. pollen season in Bahia Blanca (Argentina)

Olea europaea is one of the most prevalent aeroallergens causing allergenic reactions in the city of Bahia Blanca, Argentina. The aim of this study was to evaluate the influence of meteorological factors on the pollen season of Olea europaea L. The aerobiological analysis was performed over an 11-year period in the city. Sampling was carried out with a Rotorod model 40 volumetric impact sampler. The pollen season started in the middle of October and showed the highest values between 16 October and 24 November. A marked difference was noted over the years of this study, especially in 2005 and 2008, due to a significant decrease in the precipitation during the months prior flowering and high temperatures during the pollen season. A decreasing trend of pollen index during the study period coincided with a reduction in the precipitation from June to October (winter and spring). As expected, the air temperature prior to the onset of flowering is of great importance in determining the start of the pollen season.