Northern Metal Recycling sits along the banks of the Mississippi on a slice of prime real estate, in a North Minneapolis neighborhood long neglected. The company turns trash into money: sorting and shredding scrap metal. The Minnesota Pollution Control Agency (MPCA) also believes Northern Metals is polluting the air with heavy metals, including lead. The nearby Hawthorne Neighborhood has the second highest concentration of lead in the blood of young children. This story explores the difficulty in narrowing down air pollution to a single source, and the complicated links between lead and poverty. Originally broadcast May 15, 2017.