Figure 1.

Quantification of gas phase components, namely, n-alkanes, (methylated) PAHs, and BTX from GCB gas phase tubes by TD–GC–MS for (A) field experiments and (B) laboratory experiments. Concentrations (ng m^–3) were adjusted for blank and background levels and normalized to the corresponding sampling volume. Error bars represent the standard deviations (laboratory: n = 9; field: n = 5). The break in the y-axis at 1 × 10³ ng m^–3 (only in plot A) indicates a nonlinear scale to better visualize low concentration levels in the bar chart.