TOKYO — For Mariko Aoki, the new year began with an itch. “Right after the New Year in January, my nose starts to get a little itchy,” Aoki said. “It peaks in March, and the sneezing, runny nose, itchy throat and itchy eyes are really bad. It lasts all the way until just before Golden Week [April 29-May 5].” Aoki, like many in Japan, suffers from hay fever, or kafunsho, an annual affliction that affects more than 40% of the population — nearly double the rate in the U.S. The seasonal allergies leave many with red eyes, a stuffy nose, a sore throat and feelings of exhaustion. The combined lassitude annually costs Japan an estimated 245 billion yen ($1.5 billion) in economic losses per day during hay fever season, according to one survey. “My head feels so foggy that I can’t concentrate,” said Aoki, who works as a secretary at the National Diet — Japan’s legislature. “When it gets really bad, I go to the doctor.” In Japan, hay fever has been called a national disease. But it’s a man-made one. The majority of Japan’s hay fever sufferers are allergic to the pollen of two trees: sugi (Cryptomeria japonica) and hinoki (Chamaecyparis obtusa). Both trees were widely planted in the years following World War II as a much-needed source of timber. Sugi cones. Image by Plant Image Library via Flickr (CC BY-SA 2.0). The trees helped fuel Japan’s post-war recovery. Now, decades later, they’re fuelling a national health crisis. “People…This article was originally published on Mongabay

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