PCB Concentration by Sex and Population Group - Environmental Health Data #1498424 (License: Personal Use)

This logarithmic bar chart displays PCB (polychlorinated biphenyl) concentrations in parts per million across four population categories-northern resident, southern resident, transient orcas, and humans-with separate bars for males (blue) and females (red). Transient orcas exhibit the highest PCB levels (≈300 ppm), followed by southern and northern residents (~50-150 ppm), while humans show markedly lower concentrations (<0.3 ppm). Males consistently have marginally higher PCB burdens than females within each group, likely due to physiological differences in lipid storage and reproductive excretion.

Used in environmental science, marine biology, and public health articles discussing bioaccumulation of persistent organic pollutants in top predators and human exposure risks; supports educational content on ecosystem contamination and gender-based toxicokinetics.