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PCB stock estimates and spatial surrogates: a. City of Chicago zoning for manufacturing (pink) and open space (green); Locations of PCBs point sources indicated for transformers (blue) and sludge drying facilities (teal); b. Spatial distribution of EPCBs contained in Chicago’s PCB stocks (excluding municipal landfills); c. Chicago PCBs allocated by population, following the methods of Breivik et al. (2001).
