Developing air pollutant profiles using routine monitoring data in road tunnels: A note

A methodology is developed to convert gaseous pollutant concentrations collected at fixed monitoring points in tunnels to continuous concentration profiles. An instrumented car driven through a road tunnel is used to collect instantaneous vehicular exhaust concentration data. Regression analysis is used to compare the data obtained at fixed points in the tunnel in the same periods of time. It was found that the two sets of data were strongly correlated based on the relative slopes of the pollutant concentration profiles. There is also clustering by traffic volume.