“…NO2 is the pollutant most often used to measure pollution concentrations generated by road transportation, since it has high co-locational association with other types of pollutants such as PM and CO (Beckerman et al, 2008;Wheeler et al, 2008). Once the pollution measurements are collected at n points across a study area, several different kinds of models can be used to generate a surface map, including geostatistical interpolation methods such as kriging (Buzzelli and Jerrett, 2004;Jerrett et al, 2001), or landuse regression (Crouse et al, 2009a;Jerrett et al, 2007). The advantage of this spatial modelling, as Kingham and Dorset (2011) have noted, is that it allows pollutants to be measured at a much finer scale, and at relatively low cost.…”