Nassau County police say two of the people taken for medical evaluation were working on a refrigeration system. Freon is used as a coolant.
Waldbaum's is part of the Montvale, N.J.-based Great Atlantic & Pacific Tea Co. Spokeswoman Lauren La Bruno says customers' and workers' safety is the company's greatest priority.
Freon is a colorless liquid that evaporates when exposed to air.
Breathing large amounts of it can cause dizziness, a loss of coordination and an irregular heartbeat.
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