On March 17, 2025, following rain showers, Japan saw a significant rise in pollen dispersal, particularly from cedar trees, causing alarm among allergy sufferers. The pollen count is categorized as extremely high across various regions, including the Kanto and Tokai areas, prompting public health warnings.
The Japan Meteorological Agency's pollen forecast indicated at 12:00 PM on the same day, specific regions such as Kyushu, Tokai, and Kanto would experience intense pollen levels. With the return of warmer spring temperatures and sunny conditions, pollen dispersal is predicted to increase rapidly, aggravate allergy symptoms for many.
Temperatures across Kanto and southern Tohoku were noticeably higher compared to the previous day, with the high expected to reach 16 degrees Celsius. Such warmer conditions inherently favor the dispersion of pollen, especially from cedar trees. Tokyo residents have begun to notice the initial signs of Hinoki pollen, which has also begun to circulate.
Due to the prevailing climatic conditions following rain, pollen levels will rise dramatically, according to forecasts. The pollen count will maintain high levels on successive days with Fukuoka, Hiroshima, and Sendai expecting counts ranging from high to very high, and cities like Osaka, Nagoya, and Tokyo seeing counts varying from very high to extremely high.
On March 19, analysts predict rain across many regions, which may give residents temporary relief by suppressing pollen dispersal. Looking forward, the forecast highlights peak Hinoki pollen dispersal for late March 2025, particularly projecting increases from regions beginning with Kanto through Kyushu.
From previous days, the trend indicates on March 13 there were already burgeoning counts of Hinoki pollen at 4.0 particles per cm2 recorded in Hachioji, and at 3.1 particles per cm2 in Tama. This gradual beginning is indicative of what is to expand extensively as conditions favor the spread.
Experts suggest residents take necessary precautions during this time, especially as conditions conducive to heavy pollen dispersal include warm, dry, and windy days, or the aftermath of rainy weather followed by multiple days of warmth.
Officials encourage those affected to stay indoors whenever possible, use air conditioners with filtered air, and wear protective masks when going outside. Allergists also recommend consulting with health professionals for managing symptoms effectively during this period of elevated pollen levels.
Continued monitoring and updates are expected as the season progresses, and individuals are urged to stay informed of local weather changes to best prepare for pollen forecast updates.
Awareness and proper management are key strategies for those living or traveling to areas with high pollen counts. The push for preventative actions is timely as many allergies arise yearly during spring, particularly with the distinct increase of cedar and Hinoki pollen during this pollen season.
Residents are also reminded about the importance of proper ventilation indoors, where pollen can settle and create discomfort. Keeping windows closed during high pollen days, cleaning surfaces often, and using purifiers may help alleviate symptoms.
Overall, experts anticipate another challenging pollen season this year for residents of Japan, emphasizing the need for preparedness and proactive measures to mitigate exposure to allergens. Everyone is encouraged to stay informed, and heed local advisories through reliable sources.