Pollutive smoke bellows out of the chimneys at ArcelorMittal Spain, a part of HyDeal hydrogen plan in Spain by Justin JinDecember 12, 2022 Pollutive smoke bellows out of the chimneys at ArcelorMittal Spain, a part of HyDeal hydrogen plan in Spain. The steel-making plant will use hydrogen to replace fossil fuels in its production, eliminating CO2 emssions.