One person was transported to the hospital to be treated for chemical burns sustained at a lock manufacturing company in New Haven.
Officials said less than a gallon of sulfuric acid spilled at Assa Abloy, a lock manufacturer, and one person had a burn on his arm.
He was decontaminated before firefighters arrived and was transported to Yale-New Haven Hospital.
Crews from the state Department of Energy and Environmental Protection are at the scene.
Officials said the firefighters are taking the opportunity to use the incident as a training event.
