Feds to study potential chemical attack on NYC subway system
New York City commuters could face delays this week as federal authorities test the vulnerability of New York City's subway system to a possible chemical attack.
Beginning at 11 a.m. Monday the Department of Homeland Security will be releasing low concentrations of a harmless, non-toxic gas into several midtown Manhattan subway stations.
Officials say data from the five-day drill will help first responders better understand how airborne contaminants travel through the subway system.
There is no health risk to the public.
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