Study of atmospheric pollen by volumetric methods

Abstract

By using the Cascade Impactor the author collected 600 litres of air sample per day, from the roof of the Pharmaceutical Science Building, Toho University, Funabashi, Chiba Prefecture. Each two hour sampling period was repeated three times per week in 1987. The atmospheric pollen was recovered from the Cascade Impactor, the number of pollen grains in each sample counted under the microscope and the species identified. Seven groups of species were classified following the classification of pollen in Japan described by Ikuse (1956). Total numbers of pollen grains of each species were analysed statistically by a circular plot, a Weibull plot, an Edwards plot and a semi-logarithmic plot. The low total number of pollen grains in 1987 was due to the small quantity of tree pollen, especially of 3B type.