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The daily pollen counts in the air of Seoul, Korea were measured using a rotorod sampler from June 1990 to July 1992. Two distinct pollen periods were noted: tree pollens such as alder, poplar, willow, oak and pine appeared in the spring from March to May, and weed pollens, such as Artemisia spp., Ambrosia spp. and Hop japanese appeared in the autumn from August to September. Various kinds of grass pollen appeared from June to September. The study indicated that there were two pollen peaks in Seoul composed of tree pollens in spring and weed pollens in autumn.

Survey of airborne pollens in Seoul, Korea