Coke is used in blast furnaces in the conversion of iron ore to iron, which can be further refined to produce steel.
Coke plants produce coke from coal, using coke oven batteries.
A battery consists of a group of ovens connected by common walls. Emissions from coke ovens include a mixture of polycyclic organic matter, polynuclear aromatic hydrocarbons, benzene and other air toxics known, or suspected to cause cancer and other health problems. This file is a fact sheet on the proposed rule.