The annual means of NOx, NO2 or SPM measured at 29 monitoring stations in Yokohama city in 2005 were regressed on land use data such as residential/industrial area, traffic volume, etc, using a manual stepwise method. The adjusted R2 values for the NOx and NO2 regressions were 0.88 and 0.81, respectively. The adjusted R2 for the SPM regression was 0.55. The distributions of the concentrations were mapped using Arc-GIS software. The LUR models we developed and the concentration maps may be valid compared to other models and the LUR models developed in the western countries. However, a much higher resolution for the concentration distribution based on the LUR models might be necessary for epidemiological studies of traffic-related air pollution in Japan. We should be necessary to consider the measurement points, etc, necessary for developing the LUR models.