Cedar pollen dispersal begins in Tokyo Kyushu and Kanto will also begin full-scale dispersal in the latter half of the week –Weathernews

2022/02/21 06:54 Weathernews

This year, the scattering of cedar pollen began on February 17th in Tokyo.

In addition, in Kyushu and other areas, cedar pollen began to fly from February 15th to 16th, and the “pollen season” has begun. In the Kanto, Tokai, and western Japan, it is expected that the peak of Japanese cedar pollen will be scattered from the latter half of this week when it gets warmer.

This is due to the fact that the number of pollen detected by the Weather News pollen observer “Pauln Robo” and the number of reports of symptoms that users feel as hay fever have increased, exceeding the “pollen season start” guideline.

In the Kanto, Tokai, and western Japan, it is expected that the peak of Japanese cedar pollen will be scattered from the latter half of this week when it gets warmer.

Entering the pollen season in 13 prefectures, including Tokyo and Kyushu

By February 20, 2022, Tokyo, Kanagawa, Saitama, Shizuoka, Ehime, Kochi, Yamaguchi, Fukuoka, Saga, Nagasaki, Kumamoto, Oita, Miyazaki, Kagoshima prefectures Weathernews’ original pollen observing machine “Pauln Robo” detects pollen in 13 prefectures in 1 metropolitan area, and the number of “hard” and “slightly hard” responses from users of the smartphone app “Weather News” is increasing. Judging from the facts, we announced that we have entered the pollen season.

・ February 15
Fukuoka, Nagasaki

・ February 16
Saga, Kumamoto, Oita, Miyazaki, Yamaguchi, Kochi, Ehime, Kanagawa

・ February 17
Tokyo, Saitama, Shizuoka, Kagoshima

Male flowers of Sugi begin to fly pollen when it gets warm. Cold air continues to flow nationwide this winter, and even in February, there are many days when the temperature is low. However, from mid-February, the time has come for the cold air to weaken, although it is temporary, such as a low pressure system passing near Honshu. Due to this effect, the maximum temperature has risen to around 15 ° C in Kyushu and Shikoku, and it is probable that the flowering of male flowers has progressed and the season for scattering cedar pollen has begun.

[Guidelines for determining the start of the pollen season]
・ On days when pollen is likely to fly, more than 30% of Pauln Robo observes more than 10 pollen for 2 days or more in each prefecture.
・ User’s hay fever symptoms, Durham observation data from nearby research institutes and hospitals
We make a comprehensive judgment with reference to the above.

Scattering begins over a wide area in western and eastern Japan in the latter half of the week

[Weekly]Pollen dispersal forecast (February 22-27)

From late February to March, high and low pressures alternate, and the weather is expected to change periodically. Temperatures will remain low until the first half of this week, but warmer days than normal are expected to emerge from the second half of the week to the weekends. Especially in eastern and northern Japan, the temperature in March is expected to be higher than normal. For this reason, it is likely that scattering will begin over a wide area in western and eastern Japan in the latter half of the week.

It is expected that scattering will begin in Hokuriku and Tohoku in March.

Sugi pollen is scattered from late February to late March.

Pollen scattering peak forecast (Sugi and Hinoki)

After entering the pollen season, pollen dispersal will begin in earnest within a week to 10 days. It is expected that cedar pollen will reach its peak in western Japan, Tokai, and Kanto from the latter half of the week when it gets warmer, and in Hokuriku and Tohoku from the middle of March.

In the latter half of March, the scattering of cedar pollen gradually exceeds its peak, and the scattering of cypress pollen increases from western Japan. From late March to mid-April, cypress pollen is expected to reach its peak, mainly in western and eastern Japan. Those who are sensitive to cypress pollen should be careful, as the peak may be earlier than expected if the temperature stays high.

Hokkaido, where birch pollen is scattered, is expected to reach its peak around Golden Week in southern Hokkaido and central Hokkaido, and in mid-May in northern and eastern Hokkaido.

The amount of scattering is expected to be higher in northern Japan and Hokuriku than in 2021, and lower in western Japan.

The amount of pollen scattered in 2022 is expected to be higher in northern Japan and Hokuriku than in 2021, regarding the same in Kanto and Tokai, and lower in western Japan. In Hokkaido, it is expected to be regarding 180% compared to 2021, and in northern Tohoku and Hokuriku, it is expected to be regarding 130% compared to 2021. On the other hand, in western Japan, where the amount of scattering was large in 2021, it is expected to be regarding 75% compared to 2021.
Compared to the average year (2012-2021 average), there are many areas that are on par with the average year, and the national average is expected to be regarding 98% of the average year. However, in Hokkaido, it is expected to increase to 140% of the average year.
A large amount of pollen may be scattered temporarily or locally, such as on a warm day, a windy day, or the day following rain, so take appropriate measures.

Reference materials, etc.