Abstract

During an aeropalynological study carried out in Merced, Mexico City from October to April (dry season), pollen index of 62,097 grains was obtained using a volumetric sampler (Burkard). A total of 24 taxa were recorded, including 14 arboreal pollen types and 10 herbaceous taxa. Nonetheless, only five of the most abundant and allergenic pollen types were analyzed: Cupressaceae, Fraxinus, Liquidambar, Pinus and Quercus. Fraxinus was the most important taxon, comprising 38% of the pollen total, followed by Cupressaceae, with 17%; both taxa significantly increased during the dry cool season (November-January). Concentrations of other pollen types were not representative of the seven months analyzed.