Osaka Expo visitors struggle with swarming midges, prompting health concerns and control measures.

Swarming midges at the Osaka World Exposition are causing discomfort to visitors and health concerns. Found on walls and pillars, these flies force people to ward them off to avoid swallowing them. While not biting, inhaling dead midges can cause allergic reactions. The expo organizers are combatting the issue with insecticides, growth inhibitors, and repellent lights, with support from insecticide maker Earth Corp.