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Concentrations of 16 PAHs (a) and total PAHs (b) in coking site soils sampled at depths of 0–10 cm (T: top layer), 10–30 cm (M: middle layer), and 30–100 cm (B: bottom layer) on Day 0 (in light color) and Day 70 (in dark color). Average concentration per kind of PAH is labeled in the corresponding cell and ND denotes not detected.
