Overview

• Firefighters say the yellow discoloration faded after they knocked down the reaction with water, and the situation is largely under control.
• Roughly 250 responders secured the Mainaschaff site, and hazardous‑materials teams in protective suits conducted air measurements.
• Alerts via NINA and Katwarn urged people to stay indoors, close windows and turn off ventilation, with some city districts later receiving partial all‑clear notices.
• Initial measurements found no harmful concentrations up to five kilometers from the site, and monitoring of the surrounding area is continuing.
• Local media report the incident began when a metal part fell into an acid bath at Schnarr Heinrich GmbH, triggering the release of highly toxic nitrous gases.