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Fungal spores are important aeroallergens and proper knowledge of their qualitative and quantitative prevalence in indoor and outdoor environments is of paramount importance in the study of allergic disorders. The present investigation was aimed at the study of seasonal and annual prevalence of fungi inside a large grain storage facility. Sampling was carried out from September 1989 to August 1991. Although fungal spores occurred throughout the year there was seasonal variation. Aspergillus flavus, Cladosporium spp. Epicoccum nigrum and basidiospores had a definite seasonal pattern. Aspergillus flavus and Ustilago (smuts) were the most predominant fungi in the facility. Their concentration was significantly higher (P < 0.05) than in outside air. The need to reduce fungal concentration in grain storage is emphasised.