"Workers helping to clean up the oil spill are at high risk due to direct exposure from chemicals and toxic vapors near areas where the oil plumes are surfacing. Chemical dispersants used by BP in the cleaning process pose health risks as do vapors such as benzene, one of the volatile hydrocarbons in oil. One concern is that BP is using Corexit 9500 as a chemical dispersant. It is toxic at 2.61 PPM (parts per million) and can go through a phase transition from liquid to gas and return to earth as toxic rain. It is estimated the BP has released over 1,000,000 gallons of dispersant."
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