Lead, Arsenic, and Cadmium Contamination and Its Impact on Children's Health in La Oroya, Peru
Figure 2
Box plots of soil Pb, As, and Cd. Results are shown for the five study sites in parts per million. Sites are ordered with increasing distance from the point source. The upper panel includes the USEPA 1,200 ppm reference line for soil Pb (see text for discussion). Horizontal lines denote the median value for each site; box heights indicate the quartile limits (25% to 75%), and error bars reflect the 95% confidence intervals. Outliers are shown as open circles and asterisks.
