Gordon Ramsay on "Kitchen Nightmares" in June 2023.FOX/Getty ImagesA gallon of ammonia was spilled in the basement of a Gordon Ramsay restaurant in Illinois, local emergency services said.One person was taken to hospital in a "stable" condition, Naperville's deputy fire chief said.Staff were able to return to the restaurant later that night, the release said.A person was taken to hospital in a "stable" condition after about a gallon of ammonia spilled in the basement of a Gordon Ramsay restaurant in a city in the suburbs of Chicago, local emergency services said.On Monday night, staff from Naperville's fire department arrived at Ramsay's Kitchen in response to a call to find "approximately one gallon of ammonia spilled and off-gassing in the basement of the restaurant," Phil Giannattasio, the fire department's deputy chief, said in a release.The restaurant's staff had already alerted other staff and diners and evacuated the restaurant before the fire department arrived, he said.One civilian was transported to a nearby hospital and was "in stable condition," Giannattasio said, without giving further details.The Centers for Disease Control and Prevention notes that ammonia can cause "corrosive injury" when it comes into contact with moist tissues such as the eyes, throat, and lungs.