In April 2010, the Deepwater Horizon oil drilling rig explosion in the Gulf of Mexico released millions of gallons of crude petroleum into the water creating slicks miles wide. To break up those slicks, disaster response teams sprayed chemical dispersants primarily from aircraft and naval vessels. A study led by the University of Minnesota School of Public Health (SPH) recently examined the concentrations of the aerosol dispersant in the air and found that it likely wasn’t high enough to harm workers conducting the spraying or active in nearby areas.