Relationship of Pollen Counts of Japanese Cedar to Weather Factors in Isehara City, Kanagawa.

Abstract

We investigated the relationship of pollen counts of Japanese cedar to 9 different weather factors including means of the highest, and lowest temperatures, variation in temperatures mean of the lowest humidity on a day, daily mean, maximum wind velocity and daily wind direction in 1991, 1992, 1993 and 1995 Prefecture. The results were as follows : 1.In each year, the highest temperature and the mean humidity were statistically related to the maximum pollen counts of Japanese cedar in the air. 2.Mean pollen counts per day on the days that the wind from the southwest were much higher than on the days with wind from the south. 3.These wind directions coincided with the dense plantation areas of Japanese cedar trees around Isehara City. We concluded that in terms of accurate daily forecasting of pollen counts in the air in a certain area or city, it should be taken into consideration that the highest temperature, and mean humidity together with the wind direction from the area of dense population of Japanese cedar trees surrounding the area are closely related to the increased pollen count per day.Key words : ceder pollen counts of Japanese ceder, 9 weather factors, the highest temperature on a day, mean humidity on a day, daily wind direction

Size-segregated Allergenic Particles Released from Airborne Cryptomeria japonica Pollen Grains during the Yellow Sand Events within the Pollen Scattering Seasons

“…4b shows that peaks of airborne pollen grains appeared on March 21 under higher wind speed and temperature than the previous day. Tamura et al (1997) concluded that the highest temperature was statistically related to the maximum pollen counts of Japanese cedar in the air. The wind speed shown in Fig.…”

Environmental health implications of global climate change

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