Explanation:

In steel furnace coke reacts with iron to release pollutants like Oxides of sulphur, Oxides of nitrogen, Carbon monoxide & Carbon dioxide.Cyanides, fluorides, lead, zinc and dust particles compounds emanating from blast furnaces can find their way into cooling and cleaning waters because of direct contact with gases. Casting, scale, lubricating oils and hydraulic fluids can also contaminate the water.