On May 21, 2025, a massive flying insect infestation broke out at the Osaka World Expo site in Japan. The artificial island “Yumeshima” was not well drained due to reclamation, and the sewage area formed by mixing rainwater and underground waste became a breeding ground for Anopheles mosquitoes, and no preventive measures were taken before the opening of the World Expo, resulting in the wooden pillars of the iconic “Great Ring Roof” being covered by black mosquito swarms. As a result, the wooden pillars of the iconic “Great Ring Roof” were covered by black swarms of Anopheles mosquitoes, the air was densely populated by swarms of insects, and the vegetation and ceilings of the toilets in some areas were also covered with swarms of insects, which caused great nuisance to the visitors and also exposed the ecological problems of the reclaimed island site.
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