The incident happened at Ramsay's Kitchen on Jefferson Avenue around 9:15 pm. The restaurant is part of a chain created by celebrity chef Gordon Ramsay
One gallon of ammonia was spilled in the basement, creating dangerous fumes, according to the Naperville Fire Department.
Restaurant staff and patrons quickly evacuated the business.
Within one hour of the spill, hazmat technicians cleaned up the leak and confirmed it was safe to resume business.
No injuries were reported.
READ ALSO | 54 arrested after protest blocks I-190 near Chicago O'Hare Airport, Loop march stops traffic
What is ammonia?
Ammonia is a compound of nitrogen and hydrogen used in fertilizers and pharmaceuticals, according to the CDC.
It's also commonly mixed with water for household ammonia for cleaning surfaces.
It can be recognized by its pungent smell, which the CDC described as the odor of decaying fish.
Symptoms of ammonia exposure
Those exposed to high levels of ammonia in air may experience irritated skin, eyes, throat, and lungs - causing coughing and burns, according to the CDC.
People with asthma or chronic lung diseases could be more sensitive to the chemical than others, the CDC said.
What to do if exposed
First get away from the ammonia leak, then get it off your body.
The CDC recommends to shower as soon as you can if you came into direct contact with ammonia.
Lastly, get help by calling 911, go to the hospital, or calling the Poison Control Center at 1-800-222-1222.
To read more about ammonia exposure, click here.