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Grass Pollen Counts in Bahia Blanca, Argentina, during Ten Consecutive Years (2005-2014)
Sunday, March 6, 2016
South Exhibit Hall H (Convention Center)
Fabian M Ramon, MD, Nadia Arango, Biologist, Laura B. Barrionuevo, Biologist, Adrian M Kahn, MD FAAAAI, Julieta Ribas, Study coordinator, Nadia Abdala, Study coordinator, German D. Ramon, MD FAAAAI
Rationale: Seasonal allergic symptoms are caused by different types of pollens. It is of medical interest to have a description of pollens present in different regions in our country. The aim of this study was to evaluate grass pollen counts (Poaceae spp.) in the city of Bahia Blanca, and analyze its behavior during ten consecutive years (2005-2014).

Methods: Grass pollen counts were done with a Rotorod® Mod 40 sampler. Data was daily and expressed in grains / m3 of air and shown in the Argentine Association of Asthma and Clinical Immunology and NAB / AAAAI website. We considered the beginning of the pollen season when  pollen counts were above 10 grains / m3 for 3 consecutive days and finished 3 days before pollen counts dropped below <10 grains / m3 for 3 consecutive days

Results: There was a difference of almost a month in the beginning of the pollen season when comparing among years. We found a difference of 2 or 3 days in the start of the pollen season when “El Niño” was present, while there was a difference of almost a month between years when “La Niña” was present. Grass pollen season ended between February 13th and March 26th

Conclusions: There is variability of 30 days between years in the start and end dates of the grass pollen season. These changes may be due to specific weather events like the “El Niño” and “La Niña” phenomena, which influence the behavior of pollinating grass species.