Overview

• Emergency crews responded to nitrous gases venting from a hall through a roughly 20‑metre chimney, creating a yellow plume over Heimstetten, Feldkirchen and Kirchheim.
• Residents were told via warning apps and local radio to stay indoors with windows closed, though some reported not receiving app alerts.
• Firefighters stopped the chemical reaction after about 2.5 hours and secured the site at 21:42, with measurements showing no hazardous concentrations and no evacuation required.
• Four police officers were taken to a hospital for precautionary checks after reporting headaches, while other responders reported no health issues.
• A second yellow cloud formed during firefighting, investigators are examining the still‑unclear cause, and authorities emphasized proper setup of warning apps after the rollout drew complaints.