2023-06-28 03:29:00
2023/06/28 12:29 Weather News
Here is a summary of pollen dispersal and symptoms of hay fever in the spring of 2023 analyzed by Weathernews.
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・Amount of scattering: A large amount of scattering in western Japan and eastern Japan
・Dispersion period: The amount of dispersal increases rapidly immediately following the start of dispersal
・Symptoms of hay fever: More painful than last year, peak earlier than planned
Amount of scattering: Large amount of scattering in western Japan and eastern Japan
The amount of pollen dispersal in the spring of 2023, as observed by Weathernews’ own pollen observation device “Pollen Robo,” was 180% higher than last year and 186% higher than the average year, last year’s average.
It is characterized by a large deviation in the amount of dispersal depending on the region. While the amount of dispersal increased significantly from last year in western Japan and eastern Japan, the amount of dispersal was significantly lower than last year in northern Tohoku and Hokkaido.
What is the reason for the large amount of scattering?
The amount of pollen dispersal depends on the amount of pollen produced and the weather at the time of dispersal.
The amount of pollen produced is mainly affected by the temperature and hours of sunshine in the previous summer, and the trend of increase or decrease in pollen from year to year.
Last summer, the average temperature was above average nationwide. In western Japan, the sunshine hours were longer than normal, mainly on the Pacific Ocean side, and the weather was suitable for the growth of male flowers.
In western Japan, there were many places where the amount of dispersal last spring was relatively low, and in reaction to that, the amount of dispersal this year increased significantly. Another reason for the increase in the amount of dispersal this year is that it was sunny and warm on record in March, when the dispersal peaked.
Scattering period: Immediately following the start of scattering, the amount of scattering increased rapidly.
A characteristic of pollen dispersal in the spring of 2023 is that the period from the start of dispersal to full-scale dispersal was remarkably short due to the warm weather from February to March.
The start of dispersal was slightly later than normal in the Kanto region, while in western and northern Japan it was almost normal or slightly earlier than normal.
In normal years, full-scale dispersal occurs regarding one to two weeks following the start of dispersal, but this year, there were many areas where full-scale dispersal occurred within one week following the start of dispersal.
Symptoms of hay fever: worse than last year, peak earlier
We analyzed symptom reports (total of 128,751) from users of the smartphone app “Weather News” to find out how difficult the symptoms of hay fever were.
As a result, 23% of all respondents felt that the symptoms of hay fever were difficult, an increase of 4 points from last year.
By region, the difference from last year is particularly noticeable in the southern Tohoku region and west of the Kinki region.
Comparing the changes in symptom reports between this year and last year, the number of people who feel that the symptoms of hay fever are painful increased from late February this year, and the trend was earlier than last year. This overlaps with the timing when pollen dispersal is in full swing.
It was around February 28th that the hard rate reached its peak. Last year it was around March 12th, so the hardest time came regarding 12 days earlier than last year.
On the other hand, it was from mid-April this year and last year that the hard rate decreased. This year, I found that the period of feeling painful became longer because the peak of the symptoms was brought forward.
Pollen dispersal trends for the spring of 2024 will be announced around October.
Reference materials, etc.
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