The massive pile of black refinery waste that has sat alongside the banks of the Detoit River is gone. The 'Pet Coke' , as it's called, is the waste that's left after heave tar-sands oil is refine. It is not considered hazardous, but it does violate portions of the Clean Air act when it becomes airborne.
Throughout Detroit and Windsor, the airborne residue can be found throughout nearby neighborhoods.
Listen in as we focus on the effects of exposure of Pet Coke and the regulations to protect the health of the environment: