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Every spring, millions of people across Japan brace for weeks of sneezing, itchy eyes and relentless congestion.
Image used for illustrative purposes/kai muro/Unsplash
What many now call the country’s “national disease” has become so widespread that seasonal allergies affect workplaces, schools and daily life on a massive scale. But the roots of the problem stretch back more than 70 years.
According to recent reporting by the BBC, Japan’s hay fever crisis can largely be traced to a post-World War II forestry policy introduced in the 1950s. In an effort to rebuild the country and meet soaring timber demand, authorities planted vast areas of fast-growing cedar and cypress trees across the country.
At the time, the strategy made economic sense. Japan needed timber for homes, infrastructure and rapid urban development during its reconstruction era. Cedar trees, known for their fast growth and straight trunks, became a preferred solution.
Decades later, those same forests are now releasing enormous volumes of pollen every spring.
Many of the trees planted during the post-war boom matured around the same time, creating dense pollen clouds that sweep through towns and cities during allergy season. In some regions, experts estimate that nearly half the population experiences hay fever symptoms linked to cedar pollen.
The issue has become so severe that Japan’s government has recognised hay fever as more than just a seasonal inconvenience. Reports suggest the condition contributes to significant economic losses due to reduced productivity, disrupted sleep and missed workdays.
Climate change is also intensifying the problem. Warmer temperatures and shifting weather patterns are extending pollen seasons and increasing pollen production, while urban pollution may make people more sensitive to allergens.
In response, authorities have started replacing older cedar plantations with low-pollen tree varieties. Researchers are also exploring new medical treatments and long-term mitigation strategies. However, with cedar forests covering large portions of Japan, experts say the issue will not disappear overnight.
For many residents, spring now comes with masks, medication and daily pollen forecasts. What began as a post-war recovery plan has evolved into one of the country’s most persistent environmental health challenges.
(Source: BBC)
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