Federal lawmakers, two from Michigan and two from Illinois, have introduced bills that would require the federal government to address concerns about petroleum coke exposure.
Petroleum coke is a byproduct of refining crude oil.
The legislation calls for federal agencies to complete a study of the health and environmental risks posed by petroleum coke. It also would require the implementation of federal safety regulations for the storage and transportation of petroleum coke. The standards would be based on the study's findings.