The relative performance of a general finite line source model (GFLSM) is assessed using measured NO
obtained adjacent to an urban motorway using CEF and HEF. The predicted concentrations are compared with monitored concentrations obtained over a continuous sampling period of one year. Statistical and graphical analyses of the monitored and modelled data are employed to evaluate model performance. It is observed that the values predicted by the GFLSM generally agree well with the monitored data. The effect of background concentrations on model performance is studied and a
novel way of defining background concentrations leading to improved model performance of the model is suggested.
Keywords: line source model, traffic emissions, background concentrations, GFLSM, Ireland