Japan wants to plant no-pollen trees to solve its hay fever crisis

Mongabay
Sep 10, 2026, 2:38 am54 ptsTrending
Two species of trees helped Japan build millions of homes after World War II. However, pollen from those same trees has also fueled a nationwide hay fever allergy. More than 40% of Japan’s population now suffers from hay fever, locally called kafunsho. That’s nearly double the rate in the U.S., reports…

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