Weathernews released its “First Pollen Dispersion Trends” for the spring 2025 pollen season on October 1.
Spring 2025 pollen dispersal is expected to be above normal in western and eastern Japan. In particular, the amount of airborne pollen in western Japan is expected to be the highest in the past 10 years or comparable to that of the past 10 years.
This summer’s long hours of sunshine and high temperatures throughout the country made the weather suitable for the growth of male flowers, which are the source of pollen. As a result, the amount of pollen dispersal is expected to increase significantly next spring compared to the previous year.
Due to the high amount of birch pollen in 2024, 2025 is expected to be a “back year” in Hokkaido, with the amount of pollen dispersed at 48% of the previous year’s level and 84% of the normal level, but large amounts of pollen will be dispersed on sunny and windy days.
In the Tohoku region, some areas in the northern part of the country will experience lower amounts of pollen scattering due to a “back year,” but overall, the amount of pollen scattering is expected to be above or equal to the normal. Cedar pollen will be the main component, while cypress pollen will tend to be relatively low.
In Kanto and Yamanashi, the amount of pollen dispersed is expected to be 128% of the previous year’s level and 151% of the normal, while in Hokuriku and Nagano, the amount of pollen dispersed is expected to be 176% of the previous year’s level and 156% of the normal. In the Hokuriku area, cedar pollen will be the main pollen and cypress pollen will be relatively scarce.
The Tokai area is expected to have a mix of prefectures that are above and below the previous year’s dispersal, at 112% of the previous year’s level and 140% of the normal level.
Significant amounts of scattering are expected in western Japan in the Kinki, Chugoku, Shikoku, and Kyushu regions. In particular, the Keihanshin area will have more than 400% of the previous year’s level and 200% of the normal. In the Chugoku and Shikoku areas, it is expected to be 527% of the previous year’s level and 232% of the normal, and in the Seto Inland Sea area, it is expected to be 500-800% of the previous year’s level in some areas. Some areas in the Kyushu region are also expected to see 400% of the previous year’s level and 200% of the normal, with western Japan at risk of large amounts of dusting comparable to the past 10 years.
The company is calling for more thorough measures than in previous years. The “Second Pollen Dispersion Trend” is scheduled to be released in early December.
© Source travel watch
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