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Fungal spores are universal atmospheric components associated to allergic reactions. <i>Alternaria</i> (Ascomycota) is considered the most allergenic spore taxa. Alt a 1 is the major allergen of <i>Alternaria</i> and is present also in other <i>Pleosporales</i>. In this study, standard Hirst-based sampling and analyzing methods for measuring spore daily concentrations of <i>Alternaria</i>, <i>Curvularia</i>, <i>Drechslera-Helminthosporium</i>, <i>Epicoccum</i>, <i>Leptosphaeria</i>, <i>Pithomyces</i>, <i>Pleospora</i> and <i>Stemphylium</i> (all included in the taxon <i>Pleosporales</i>) have been used as well as two high-volume samplers, Burkard Cyclone (2017) and MCV CAV-A/mb (2019–2020), and ELISA kits for measuring the allergen. The detection and quantification of Alt a 1 was only possible in the samples from the MCV sampler. Although Alt a 1 was better correlated with <i>Alternaria</i> spores than with <i>Pleosporales</i> spores, the three of them showed high correlations. It is shown that there is a high and significant correlation of Alt a 1 with temperature, a negative correlation with relative humidity and no correlation with precipitation. The aerobiological monitoring of these three elements ensures the best information for understanding the affectation to allergy sufferers, but, if this is not possible, as a minimum public health service aimed at the detection, treatment and prevention of allergies, the study of the airborne <i>Alternaria</i> spores should be ensured.