An aeropalynological survey by gravitational sampler was done in St. Mary's Hill of Kurseong, a subtropical biozone of Eastern Himalayas at 1650 m altitude for a period of two years (March 1981-February 1983) to record the incidence and frequency of airborne pollen grains. A total of 32 pollen types were recorded where tree pollen grains showed dominance over those of grasses and weeds. Frequency of established allergenic pollen grains was fairly high throughout the year.