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Figure 6.1 shows two plots of model results. The figure on the left is a line graph plotting predicted concentrations of carbon monoxide (CO) at a particular location on the y-axis against the hour of day on the x-axis. Levels of CO vary significantly throughout the day with a peak mid-morning. The figure on the right is a bar graph of frequency of odour (y-axis) throughout the year (x-axis). Peak events occur in winter.