Measurement of PM10 were performed by a Beta-ray absorption method using a continuous particulate monitor. SO2 measurements were perform using a pulse UV Fluorescence method, CO measurements using a non-dispersive infrared method, NO2 using a chemiluminescent method, and O3 using a UV photometric method. Instruments and models for each compound, hourly Limits of Detection (LOD), and upper limits are listed in table S6.