6 As can be seen, during morning peak-time journeys the CO

6 As can be seen, during morning peak-time journeys the CO concentrations for car passengers were signifi cantly lower than for pedestrians, which is consistent with results obtained in previous studies.1,2 7 However, the modelled data were not consistent with these results for aft ernoon journeys. 8 Although the mean CO concentrations modelled by TEM for aft ernoon journeys on foot were in line with those of Figo et al., a striking diff erence was noted when each of the three peak hours was considered singly (Fig. 2).