Trumbull EMS and fire crews from Long Hill, Trumbull Center, and Nichols evaluated 15 people at the scene at about 11:30 a.m., the Times said.
An ounce of Formocresol, a disinfectant used in a treatment, spilled and caused a strong odor, Long Hill Deputy Fire Chief Alex Rauso Jr. told the Trumbull Times.
Employees returned after the office was ventilated, the Trumbull Times said.
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