# Why does Hydrogen fuel still result in pollution?

Most of the Hydrogen that is created is done by Steam Reforming . As you can see from the reference, a hydrocarbon is use to release Hydrogen from water and a by product is either $C O$ or $C {O}_{2}$. However, this is a bit of a false statistic, because most Hydrogen produced in this manner is used by oil refineries to remove Sulfur from Crude oil so that the gasoline and diesel fuel produced from the Crude oil do not contain Sulfur.