Approximately 200 people sought help for trouble breathing, shortness of breath.
People watch smoke rise from the Chevron refinery in Richmond, Calif., from a vantage point in the El Cerrito, Calif., hills Monday, Aug. 6, 2012. Officials have told residents of two Northern California cities to shelter-in-place as a fire at a Chevron refinery in Richmond releases plumes of black smoke. (AP Photo/The Daily Republic, Brad Zweerink)
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