The anthropogenic (Cs, Sr, Pu and Am) and naturally occurring radionuclide (K, U, Th, Ra and Pb) content in near surface air present seasonal variations related to natural processes, such as soil erosion, resuspension of fine particles of soil and radon exhalation from soil (Pb). The objective is to analyze seasonal variations of their concentrations and compare with radiological events (Fukushima fallout and wild fire) in a location without any known source of anthropogenic radionuclides. The Pb, K, and Cs presented annual variations, with maximum activity levels in summer. Solar radiation and rainfall were correlated with Pb and K. The U, Th, Ra, Cs and Sr presented positive correlation with monthly mean values of temperature. The ratio Sr/Cs was within the range of those reported for soils in Spain. Finally, the maximal effective dose rate was estimated to be 37 and 88 μSv/y for infants and adults, respectively, well below 1 mSv/y reference level. The main contributor to effective dose was Pb, about 92%, followed by: Pb ≫ Th > Ra, U > Be, Pu > K, Sr > Cs > Na.
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