Fig. 3.

Dynamic range of the detector. Response of the detector (Tenax separation column + Pd-doped SnO₂ sensor) to 1–918 ppm methanol concentrations (black squares and dashed line). The median methanol concentration in healthy breath³⁵ (green dashed line), exogeneous³⁶ (orange dashed line), and toxic¹ breath levels (red dashed line and shaded area) are indicated. Measurements were performed with 10 s exposure of all methanol concentrations at 50% RH and a flow rate of 25 mL min⁻¹ through the detector