The cloud of chlorine gas was contained to a lab room inside the Medical Bimolecular Research Building.
Chapel Hill officials say the leak originated on the sixth floor of the nine-story building and it was evacuated.
One person drove himself to the emergency room as a precaution, after experiencing mild respiratory symptoms. He is expected to be okay.
The fire department and UNC Health and Safety crews stayed at the scene until the area was cleared.
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