Councilor Kenta Teramoto, a former firefighter and member of the Moriguchi City Council, brought his own gas detector to the Osaka Expo 2025 test run. He measured methane gas exceeding 100% LEL (Lower Explosive Limit)—a concentration high enough to ignite with a lighter.
After staff ignored his warnings, he called emergency services (119) himself.
He later released a full video testimony with English subtitles.
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