An earlier version of this story listed a Baltimore galvanizing plant as the nation’s top industrial source of lead pollution, based on industry-reported data to the U.S. Environmental Protection Agency’s Toxics Release Inventory. Southern Galvanizing Co. said it miscalculated the facility’s lead emissions in 2015 and 2016 and actually emitted about 20 pounds of lead during each year. Both ArcelorMittal and the EPA confirmed annual pollution reporting for the Burns Harbor steel mill, which topped the nation in industrial lead emissions between 2014 and 2016.