D2.402 - Main Pollen Types Identified in Aerobiological Stations of the Latin American Aerobiology Network (Red Latinoamericana de AerobIología, RLA)

The Latin American Aerobiology Network is a collaborative group of active aerobiological stations located in various cities across Latin America. This study reports the main pollen types identified in the cities within the RLA, which could potentially affect allergic patients with pollinosis traveling from other latitudes.

Data was collected from RLA coordinators, using Rotorod M40® and/or Burkard spore traps for 7-day sampling intervals. We followed National Aerobiology Board (NAB) pollen counter guidelines. The selection of pollen types was based on their frequency and seasonal variation.

In Argentina (Bahía Blanca), Poaceae (grass) was the most abundant, peaking from November to January. Olea europaea (olive) and Amaranthaceae were also significant. In Brazil (Paraná), Poaceae dominated, with peak concentrations from September to November. In Minas Gerais, the station is still in the early stages of data collection, and results are being compiled for future analysis. In Chile (Santiago de Chile), Poaceae peaked from September to December, while Olea europaea and Platanus spp. also appeared in significant concentrations. In Ecuador (Guayaquil), Poaceae (the dominant pollen type) had two peaks, one from March to April and another from September to December, Ambrosia spp. was also registered. Paraguay (Asunción) also showed two Poaceae peaks in February and September. In Peru (Lima), Poaceae (also the dominant type) peaked from November to January, and Olea europaea was prominent together with Amaranthaceae. In Puerto Rico (San Juan), tropical pollen types such as Cecropia spp., Mimosa spp. and Rizophora mangle were the predominant whereas in Mexico (Ciudad Victoria), Moraceae, Cupressaceae, and Urticaceae were the main pollen types.

Poaceae (grasses) was the most common pollen type across Latin America, with peak concentrations between September and January, aligning with the Southern Hemisphere’s spring and summer. This is important for patients with pollinosis, as it marks a predictable period of heightened exposure. Regional variations in pollen patterns highlight the need for allergists to consider these factors when advising patients, especially those traveling to different areas of Latin America. For that reason, we encourage other aerobiologists to join the RLA, helping to improve the management of allergic diseases in the region.