Seasonal Oxidation Potential of Vehicle Emission using Tunnel Flow Coefficient

Seasonal samples located in Seoul were collected from inside and outside tunnel at the same time to determine the oxidation potential (OP) using dithiothreitol (DTT) method corresponding to real-world vehicle emissions. First, the novel quantitative oxidation potential method was developed using 9,10-phenanthraquinone. Second, quinone normalized DTT-OP was utilized to calculate the seasonal oxidation potential of unit vehicle emission with tunnel flow coefficient. As a result, the overall average for seasonal oxidation potential of unit vehicle emission were shown as 169 μM/veh · km. In addition, the highest concentration was presented from midnight through 6 a.m. for all seasons due to complex parameters including vehicle speeds. This result will be able to investigate the health studies associated with unit of vehicle emissions in real atmosphere.