日本語・Markdown

Consumer Affairs Agency accident cases

Consumer Affairs Agency accident information

The Japanese Consumer Affairs Agency (CAA) maintains an accident information database that publicly catalogues incidents related to high-concentration hydrogen inhalation devices. These are recorded as incidents involving explosion or ignition during real-world inhalation use.

Patterns in reported cases

Aggregating the published cases:

• High-concentration (≥ 66%) output devices dominate
• Cases include compound facial, airway, and pulmonary trauma
• Static electricity, electrical sparks, and mucosal friction are inferred as ignition sources in several cases

Implications

These cases demonstrate that the argument "100% pure hydrogen exceeds the UFL and is therefore safe" cannot explain the documented harms. The combination of boundary-layer flammable-range crossover, mixing within the airway, and hydrogen's very low minimum ignition energy produces accidents the designers did not anticipate (→ Inhalation concentration).

Data source

• Consumer Affairs Agency Accident Information Database: https://www.jikojoho.caa.go.jp/ai-national/
• Search keywords: 「水素」, 「水素吸入」, 「水素発生」

Individual case IDs and details should be consulted directly against the database. This page aggregates trends; the primary data lives at the CAA and should be cited directly.