The toxic styrene leak near Cincinnati is one of many chemical spills that have polluted the air or water in or near Ohio. Here's a look at some others.

A local lung specialist has reassured residents that short-term exposure to styrene, a compound used in plastics, is unlikely to have a lingering impact.

Plumes of white vapor shot out from a pressure release valve of a rail car, leaking styrene — a toxic chemical — that saturated the area in a pungent odor midday Tuesday.