Short-Term Machine Learning Calibration of PID Sensors for Ambient VOC OH reactivity - Supplementary Material

This document provides supplementary tables and figures supporting the manuscript “Short-Term Machine-Learning Calibration of PID Sensors for Ambient VOC OH Reactivity”. The primary calibration target is PTR-derived VOC OH reactivity (ROH,PTR, s⁻¹), computed from a selected VOC set measured by PTR-ToF-MS using published OH reaction rate constants. For transparency, the summed VOC mixing ratio (ΣVOCPTR, ppb) based on the same VOC set is also defined as an auxiliary reference metric.