U.S. Senator Gary Peters, D-Michigan, has introduced legislation with Illinois Senator Dick Durbin to require a study of the health effects of petroleum coke, along with best practices for storage and disposal.
Peters says both Chicago and Detroit have had problems with open piles of pet coke, which is a byproduct of processing heavy tar sands oil.
A huge pile of pet coke was stored near the Detroit River in 2013 and 2014.
"It was blowing into people's homes, going into the Great Lakes, people had respiratory issues because of the dust that was blowing," says Peters. He says one video showed "the Ambassador Bridge in the background, and the cloud of dust was so thick it obscured the bridge."