Development of models for predicting roadside nitrogen dioxide concentrations and their evaluation against datasets measured in Dublin, Ireland

Different methods for predicting levels of roadside NO2 from NOx concentrations have been proposed. Prior work suggests that either a linear or a logarithmic relationship exists among the roadside NO2 and NOx concentrations. We modify and compare those methods with new formulations based on the principles of the original methods for datasets pertaining to Dublin. A new relationship based on the power law is developed to better model the decay of the ratio of (NO2/NOx)road ratio with increasing NOx concentration. These formulations are compared and examined at two study sites: at an intermittently congested urban street canyon and a free-flowing motorway.