On March 23, 2025, the warm weather sweeping across Japan has triggered a significant rise in pollen levels, particularly affecting those with hay fever. From Kyushu to the Kanto region, temperatures have soared, providing the perfect conditions for pollen to scatter in large quantities.
In Gunma Prefecture, a notable pollen halo has become visible, further indicating the vast amount of pollen present. Early in the day, the pollen observation machine 'Pollen Robo,' deployed by Weather News across 1000 locations nationwide, reported that pollen levels were 'very high' or 'extremely high' in many areas. By 10:00 AM, it was established that Gunma Prefecture was experiencing the highest pollen scattering in the country.
The meteorological phenomenon is largely attributed to a weather pattern known as the southern high-northern low pressure system, which is pushing warm air over the western and eastern parts of the country. Sunny spells have brightened the skies, allowing temperatures to rise at a quick rate. As the warm weather persists, regions can expect pollen to continue to scatter in large amounts throughout the day.
Weather forecasts for this Sunday indicate a delightful, sunny day across various regions, with significant temperatures enhancing the spring-like atmosphere. In fact, cities across Kyushu, Shikoku, and Kanto are seeing temperatures rise above 20 degrees Celsius, with potential summer days recorded. For example, Fukuoka is expected to reach 25 degrees Celsius, and Kochi could see temperatures of 26 degrees. In the Tokyo metropolitan area, the day may reach 25 degrees Celsius, possibly marking the first summer day of the year.
Importantly, residents experiencing hay fever must exercise caution as the sunny weather correlates with the increased pollen levels. Experts recommend thorough countermeasures, such as wearing masks and using eye drops. Wearing glasses can significantly reduce pollen entering the eyes by approximately 40%, while specialized eyewear can reduce this by as much as 65%, effectively protecting against the irritants.
The recommended masks are those fitted closely to the face, and studies suggest that these masks can lower pollen inhalation to about one-third to one-sixth of typical amounts. Additionally, residents are advised to make careful clothing choices; wearing wool can pose a higher risk of attracting pollen compared to cotton or synthetic fiber, with wool attracting about ten times more pollen than cotton fabrics.
While southern regions bask in the warm sunshine, northern areas such as Hokuriku and Hokkaido are experiencing markedly colder conditions. Despite the sunny outlook across much of Japan, forecasts suggest that snowfall may still affect parts of Hokkaido through midday. Conditions should improve later in the afternoon, transitioning to clearer skies.
Furthermore, the arrival of yellow sand is anticipated, with predictions that this phenomenon will affect large areas from Kyushu to Tohoku around March 25, 2025. This added element to the weather may further complicate outdoor activities and health concerns, especially for those sensitive to airborne particles.
In summary, March 23, 2025, heralds a day of significant pollen dispersal across Japan, coinciding with warmer temperatures reminiscent of early summer. Those prone to hay fever should heed warnings and take protective measures to navigate the pollen-laden atmosphere safely.
