A styrene leak in the East End near Lunken Airport in 2005 led to several days of evacuations for residents and a multi-million dollar class-action lawsuit.
A rail car in the area of Cleves and Whitewater Township is longer leaking styrene, but evacuation orders and the closure of roads and businesses in the area remain in place.
While the leak coming from the train car appeared to be a gas, the National Institute of Environmental Health Sciences says styrene is a colorless, flammable liquid used to make plastics and rubber.
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