The incident took place in Griesheim Industrial Park on Tuesday morning, according to firefighters. “Doors and windows in the area of Griesheim and [nearby] Nied are to be kept closed,” the warning said.
Locals were advised to switch off air-conditioning units and ventilation. Traffic was also halted due to the incident.
The fire department asked people to turn on their radios, and released a map showing the affected area on Twitter. Warning sirens were triggered in both locations as a precaution.
Specialists assessed the environment and detected no hazardous elements, police said, adding that the warning had been quickly lifted in both areas.
Hydrochloric acid is a strong corrosive substance used as a laboratory reagent. The short-term effects of inhalation can include irritation to the nose, eyes, and respiratory tract.