Survey of airborne pollen and fungal spores at Dehra Dun, India.

A survey of airborne pollen and fungal spores was carried out using a gravity settling device at Dehra Dun for two consecutive years (1980-81). The daily, seasonal, and annual variations recorded for the dominant pollen and spore types are analysed in detail. Two distinct peak pollen periods, February-April and August-October, have been recognized although pollen was found present in the atmosphere throughout the year. In contrast, fungal spores did not exhibit any distinct seasonal pattern. July through October has been observed as the period of higher spore catch as compared to other months. Pollen grains of Pinus are recorded as the most dominant type at Dehra Dun followed by Broussonetia, Rosaceae, Poaceae, Debregeasia, Rumex, and Morus. Among fungal types, Cladosporium, Alternaria, smut spores, Curvularia, Ascospores, Nigrospora, Aspergilli/Penicilli, and Epicoccum dominated the atmosphere in order of their prevalence.