Work apparently was being done when a mixture was poured that created the fumes in the kitchen area of the Pitkin Education Building off Paramus Road around 4 p.m.
No students were affected, responders said.
The building, which houses the Student Center, was evacuated and was to remain closed Tuesday evening.
Paramus firefighters responded along with Bergen County sheriff's officers, a Bergen County Hazardous Materials Unit and multiple ambulances.
Water was used to dilute the product.
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