A carbon dioxide leak at Anam Station on Seoul's subway Line 6 caused a temporary evacuation and train disruptions on June 16, 2026. The leak occurred during a fire safety inspection at a substation, releasing CO2 into the station building. All passengers and staff were evacuated, and trains bypassed the station until the gas cleared. No injuries were reported. The incident highlights the risks associated with CO2 used in fire suppression systems. While CO2 is not toxic at low concentrations, it can displace oxygen in confined spaces, posing asphyxiation hazards. Seoul Metro confirmed that service resumed after the gas was fully discharged and safety checks were completed. For those following carbon management and safety protocols, this event underscores the importance of proper handling and monitoring of CO2 in public infrastructure. It also raises questions about maintenance procedures and emergency response in transit systems.
