What are the common misunderstandings about getting through pollen season?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Hay fever exists all over the world, but Japanese cedar (sugi) pollen is unusual in both volume and duration. Many foreign residents develop symptoms for the first time after a few springs here. In 2023 the government adopted an overall pollen-allergy strategy, covering pollen forecasts and the cedar forests that produce it. Here is what the public guidance says and what people in Japan actually do.
Numbers and policy
- A Ministry of the Environment survey puts the prevalence of cedar pollen allergy at about 40% (38.8% in the 2019 nationwide survey for the Japanese Guidelines for Allergic Rhinitis).
- In May 2023 the government adopted the "Overall Picture of Pollen Allergy Countermeasures" (花粉症対策の全体像). Its three pillars are faster felling and replanting of planted cedar forests (a 20% cut in pollen sources within 10 years), more accurate pollen forecasts, and wider uptake of therapies.
- Cedar pollen in the Kanto region (Tokyo area) flies from early February to April; cypress (hinoki) from March to May.
| Situation | What people in Japan do | Basis |
|---|---|---|
| Going out | Mask and glasses. Avoid the heaviest periods, around midday and around sunset | Ministry of the Environment, "Pollen Allergy Environmental Health Manual" |
| Coming home | Brush off clothes at the entrance; do not bring your coat into the living space | Same |
| Laundry and bedding | On high-pollen days, dry laundry indoors; vacuum futons and bedding | Same |
| Cleaning | Wipe surfaces first (so as not to stir pollen up); ventilate only briefly | Same |
[Verify] Check the prevalence figure and the date the strategy was adopted against the Ministry of the Environment "Pollen Allergy Environmental Health Manual" and the Prime Minister's Office material for the "Ministerial Meeting on Pollen Allergy".
Misunderstanding 1｜Pollen does not fly on rainy days
Less pollen flies in the rain, but the next sunny day tends to bring a heavy count, as the pollen knocked down by the rain is added to the new release.
Misunderstanding 2｜Pollen is heaviest first thing in the morning
In urban Kanto the peaks are generally described as coming around midday and around sunset (when pollen higher in the air comes down to ground level).
Misunderstanding 3｜Stop ventilating and the room is safe
Without ventilation, house dust and carbon dioxide become a different problem. The usual practice is to ventilate briefly with the net curtains closed, at times of low pollen such as early morning or night.
Misunderstanding 4｜Over-the-counter medicine means no need for daily precautions
Medicine is a means of keeping symptoms down. Reducing your contact with pollen helps to reduce the amount of medicine you need. Ask a pharmacist or doctor about which medicine to choose.
Misunderstanding 5｜Once you have hay fever, nothing can be done
Therapies that address the underlying allergy, such as sublingual immunotherapy (舌下免疫療法), are available under Japanese health insurance. The government strategy also aims to spread them more widely. Whether you are a suitable candidate is for a doctor to decide.
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Sources
- Ministry of the Environment, "Pollen Allergy Environmental Health Manual" [花粉症環境保健マニュアル]
https://www.env.go.jp/chemi/anzen/kafun/manual.html
- Prime Minister's Office, "Ministerial Meeting on Pollen Allergy": Overall Picture of Pollen Allergy Countermeasures (30 May 2023) [花粉症対策の全体像]
https://www.kantei.go.jp/jp/singi/kafun/index.html
- Ministry of the Environment, pollen observation system "Hanako-san" (discontinued) / Japan Weather Association pollen information
https://www.env.go.jp/chemi/anzen/kafun/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
This article is not meant to diagnose or manage any specific medical condition. If you are worried about your health, see a doctor rather than relying on your own judgement.
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